Wikipedia:WikiProject Mathematics/List of mathematics articles (R)

R
R (complexity)  -- R-algebroid  -- R-matrix  -- Rabatment of the rectangle  -- Rabdology  -- Rabin signature algorithm  -- Rabinovich–Fabrikant equations  -- Rabinowitsch trick  -- Racah polynomials  -- Racah W-coefficient  -- Racemic acid  -- Racetrack (game)  -- Racetrack principle  -- Rachael Meager  -- Racks and quandles  -- RACSAM  -- Radar chart  -- Rademacher complexity  -- Rademacher distribution  -- Rademacher–Menchov theorem  -- Rademacher system  -- Rademacher's theorem  -- Rader's FFT algorithm  -- Radial basis function  -- Radial basis function interpolation  -- Radial basis function network  -- Radial function  -- Radial set  -- Radially unbounded function  -- Radian  -- Radiation law for human mobility  -- Radiative flux  -- Radical axis  -- Radical extension  -- Radical of a Lie algebra  -- Radical of a module  -- Radical of a ring  -- Radical of an algebraic group  -- Radical of an ideal  -- Radical of an integer  -- Radical polynomial  -- Radical probabilism  -- Radical symbol  -- Radicial morphism  -- Radio coloring  -- Radio navigation  -- Radiodrome  -- Radius  -- Radius (graph theory)  -- Radius of convergence  -- Radius of curvature  -- Radius of gyration  -- Radix  -- Radix economy  -- Radix point  -- Rado graph  -- Radó–Kneser–Choquet theorem  -- Rado's theorem  -- Radó's theorem (harmonic functions)  -- Rado's theorem (Ramsey theory)  -- Radó's theorem (Riemann surfaces)  -- Radon measure  -- Radon–Nikodym set  -- Radon–Nikodym theorem  -- Radon–Riesz property  -- Radon transform  -- Radon's theorem  -- Radonifying function  --

Rag
Raghunatha Siromani  -- Ragsdale conjecture  -- Raikov's theorem  -- Rainbow coloring  -- Rainbow-independent set  -- Rainbow matching  -- Rainville polynomials  -- Raised cosine distribution  -- Raising and lowering indices  -- Raising Genius  -- Rajchman measure  -- Rake (angle)  -- Ramanujam–Samuel theorem  -- Ramanujam vanishing theorem  -- Ramanujan graph  -- Ramanujan Institute for Advanced Study in Mathematics  -- Ramanujan Math Park  -- Ramanujan Mathematical Society  -- Ramanujan–Nagell equation  -- Ramanujan–Petersson conjecture  -- Ramanujan prime  -- Ramanujan–Sato series  -- Ramanujan–Soldner constant  -- Ramanujan summation  -- Ramanujan tau function  -- Ramanujan theta function  -- Ramanujan's congruences  -- Ramanujan's constant  -- Ramanujan's lost notebook  -- Ramanujan's master theorem  -- Ramanujan's sum  -- Ramanujan's ternary quadratic form  -- Ramer–Douglas–Peucker algorithm  -- Ramification  -- Ramification (mathematics)  -- Ramification group  -- Ramification theory of valuations  -- Ramified forcing  -- Ramism  -- Ramp function  -- Ramsey cardinal  -- Ramsey class  -- Ramsey RESET test  -- Ramsey theory  -- Ramsey-Turán theory  -- Ramsey's theorem  --

Ran
Ran space  -- Rand index  -- Randić's molecular connectivity index  -- Randolph diagram  -- Random-access Turing machine  -- Random algebra  -- Random binary tree  -- Random cluster model  -- Random coil  -- Random compact set  -- Random dynamical system  -- Random effects estimation  -- Random effects model  -- Random element  -- Random Fibonacci sequence  -- Random field  -- Random forest  -- Random geometric graph  -- Random graph  -- Random graph theory of gelation  -- Random group  -- Random matrix  -- Random measure  -- Random minimum spanning tree  -- Random neural network  -- Random number  -- Random number book  -- Random number table  -- Random optimization  -- Random permutation  -- Random permutation statistics  -- Random polytope  -- Random recursive tree  -- Random regular graph  -- Random sample consensus  -- Random-sampling mechanism  -- Random search  -- Random self-reducibility  -- Random sequence  -- Random surfing model  -- Random tree  -- Random variable  -- Random variate  -- Random walk  -- Random walk closeness centrality  -- Random walk hypothesis  -- Randomization  -- Randomized algorithm  -- Randomized algorithms as zero-sum games  -- Randomized response  -- Randomness  -- Randomness extractor  -- Randomness merger  -- Randomness test  -- Range (statistics)  -- Range of a function  -- Range searching  -- Rank (differential topology)  -- Rank (graph theory)  -- Rank (linear algebra)  -- Rank 3 permutation group  -- Rank correlation  -- Rank error-correcting code  -- Rank factorization  -- Rank-into-rank  -- Rank–nullity theorem  -- Rank of a group  -- Rank of a partition  -- Rank of an abelian group  -- Rank of an elliptic curve  -- Rank product  -- Rank ring  -- Rank–size distribution  -- Rank-width  -- Ranked poset  -- Rankin–Cohen bracket  -- Rankin–Selberg method  -- Rankine–Hugoniot conditions  -- Rankine-Hugoniot equation  -- Rankine vortex  -- Rankine's method  -- Ranking  -- Rankit  -- Ranklet  --

Rao
Rao–Blackwell theorem  -- Raptor code  -- Rare disease assumption  -- Rarita–Schwinger equation  -- Rasch model  -- Rasch model estimation  -- Rasiowa–Sikorski lemma  -- Rastrigin function  -- Rata Die  -- Rate distortion theory  -- Rate function  -- Rate of convergence  -- Rathjen's psi function  -- Ratio  -- Ratio distribution  -- Ratio estimator  -- Ratio of uniforms  -- Ratio scale  -- Ratio test  -- Rational agent  -- Rational approximation  -- Rational arrival process  -- Rational consequence relation  -- Rational dependence  -- Rational difference equation  -- Rational fideism  -- Rational function  -- Rational homotopy theory  -- Rational mapping  -- Rational monoid  -- Rational normal curve  -- Rational normal scroll  -- Rational number  -- Rational point  -- Rational quadratic covariance function  -- Rational reciprocity law  -- Rational reconstruction (mathematics)  -- Rational representation  -- Rational root theorem  -- Rational sequence topology  -- Rational series  -- Rational sieve  -- Rational singularity  -- Rational surface  -- Rational variety  -- Rational zeta series  -- Rationalisation (mathematics)  -- Rationality  -- Ratnakīrti  -- Ratner's theorems  --

Rau
Rauch comparison theorem  -- Rauzy fractal  -- Raven paradox  -- Ravenel's conjectures  -- Raviart–Thomas basis functions  -- Raw data  -- Raw score  -- Ray casting  -- Ray class field  -- Ray transfer matrix analysis  -- Rayleigh dissipation function  -- Rayleigh distribution  -- Rayleigh–Faber–Krahn inequality  -- Rayleigh mixture distribution  -- Rayleigh–Plesset equation  -- Rayleigh quotient  -- Rayleigh quotient iteration  -- Rayleigh–Ritz method  -- Rayleigh test  -- Rayleigh theorem for eigenvalues  -- Rayleigh's equation (fluid dynamics)  -- Rayleigh's quotient in vibrations analysis  -- Raymond Cattell  -- Raynaud surface  -- Raynaud's isogeny theorem  -- Rayo's number  -- RBC (code)  -- RE (complexity)  -- RE-complete  -- Reach (mathematics)  -- Reachability  -- Reaction–diffusion system  -- Read-once function  -- Read's conjecture  -- Real algebraic geometry  -- Real analysis  -- Real Analysis Exchange  -- Real analytic Eisenstein series  -- Real closed field  -- Real closed ring  -- Real computation  -- Real coordinate space  -- Real element  -- Real form (Lie theory)  -- Real hyperelliptic curve  -- Real number  -- Real plane curve  -- Real point  -- Real projective line  -- Real projective plane  -- Real projective space  -- Real radical  -- Real RAM  -- Real rank (C*-algebras)  -- Real representation  -- Real-root isolation  -- Real structure  -- Real-Time Outbreak and Disease Surveillance  -- Real tree  -- Real-valued function  -- Real variable  -- Realcompact space  -- Reality  -- Reality structure  -- Realizability  -- Realization (probability)  -- Realization (systems)  -- Rearrangement inequality  -- Reason  -- Reasoning system  -- Reassignment method  --

Rec
Recall bias  -- Recamán's sequence  -- Receiver operating characteristic  -- Recession cone  -- Reciprocal difference  -- Reciprocal distribution  -- Reciprocal Fibonacci constant  -- Reciprocal gamma function  -- Reciprocal lattice  -- Reciprocal polynomial  -- Reciprocal rule  -- Reciprocals of primes  -- Reciprocation  -- Reciprocity  -- Reciprocity (engineering)  -- Reciprocity law  -- Reckoning board  -- Reconstruction conjecture  -- Record linkage  -- Record value  -- Recreational mathematics  -- Rectangle  -- Rectangle packing  -- Rectangular function  -- Rectangular lattice  -- Rectangular mask short-time Fourier transform  -- Rectangulus  -- Rectifiable set  -- Rectification (geometry)  -- Rectified 10-cubes  -- Rectified 10-orthoplexes  -- Rectified 10-simplexes  -- Rectified 120-cell  -- Rectified 2 31 polytope  -- Rectified 24-cell  -- Rectified 24-cell honeycomb  -- Rectified 5-cell  -- Rectified 5-cubes  -- Rectified 5-orthoplexes  -- Rectified 5-simplexes  -- Rectified 6-cubes  -- Rectified 6-orthoplexes  -- Rectified 6-simplexes  -- Rectified 600-cell  -- Rectified 7-cubes  -- Rectified 7-orthoplexes  -- Rectified 7-simplexes  -- Rectified 8-cubes  -- Rectified 8-orthoplexes  -- Rectified 8-simplexes  -- Rectified 9-cubes  -- Rectified 9-orthoplexes  -- Rectified 9-simplexes  -- Rectified Gaussian distribution  -- Rectified prism  -- Rectified tesseract  -- Rectified tesseractic honeycomb  -- Rectified truncated cube  -- Rectified truncated dodecahedron  -- Rectified truncated icosahedron  -- Rectified truncated octahedron  -- Rectified truncated tetrahedron  -- Rectilinear minimum spanning tree  -- Rectilinear polygon  -- Rectilinear Steiner tree  -- Recurrence period density entropy  -- Recurrence plot  -- Recurrence quantification analysis  -- Recurrence relation  -- Recurrent event analysis  -- Recurrent point  -- Recurrent sequence  -- Recurrent tensor  -- Recurrent word  -- Recursion  -- Recursion (computer science)  -- Recursionism  -- Recursive Bayesian estimation  -- Recursive definition  -- Recursive economics  -- Recursive function  -- Recursive indexing  -- Recursive language  -- Recursive largest first algorithm  -- Recursive partitioning  -- Recursive set  -- Recursive tree  -- Recursive wave  -- Recursively enumerable language  -- Recursively enumerable set  -- Recursively inseparable sets  --

Red
Red auxiliary number  -- Red-black tree  -- Redescending M-estimator  -- Redheffer matrix  -- Redheffer star product  -- Redshift conjecture  -- Reduced chi-squared statistic  -- Reduced cost  -- Reduced derivative  -- Reduced dimensions form  -- Reduced homology  -- Reduced product  -- Reduced residue system  -- Reduced ring  -- Reduced row echelon form  -- Reducible variety  -- Reducing subspace  -- Reduct  -- Reductio ad absurdum  -- Reduction  -- Reduction (complexity)  -- Reduction (mathematics)  -- Reduction (recursion theory)  -- Reduction of order  -- Reduction strategy  -- Reductive dual pair  -- Reductive group  -- Reductive Lie algebra  -- Redundancy (information theory)  -- Redundant binary representation  -- Redundant CORDIC  -- Redundant proof  --

Ree
Ree group  -- Reeb foliation  -- Reeb graph  -- Reeb sphere theorem  -- Reeb stability theorem  -- Reeb vector field  -- Reed–Muller code  -- Reed–Muller expansion  -- Reed–Solomon error correction  -- Reeh–Schlieder theorem  -- Rees algebra  -- Rees decomposition  -- Rees factor semigroup  -- Rees matrix semigroup  -- Reeve tetrahedron  -- Refactorable number  -- Reference class forecasting  -- Reference class problem  -- Refinable function  -- Refinement (category theory)  -- Refinement (topology)  -- Refinement calculus  -- Refinement monoid  -- Reflected binary code  -- Reflected Brownian motion  -- Reflecting cardinal  -- Reflection (mathematics)  -- Reflection formula  -- Reflection group  -- Reflection lines  -- Reflection principle  -- Reflection principle (disambiguation)  -- Reflection principle (Wiener process)  -- Reflection symmetry  -- Reflection theorem  -- Reflective subcategory  -- Reflexive closure  -- Reflexive module  -- Reflexive operator algebra  -- Reflexive relation  -- Reflexive sheaf  -- Reflexive space  -- Reform mathematics  --

Reg
Regenerative process  -- Regev's theorem  -- Regge calculus  -- Regge–Wheeler–Zerilli equations  -- Regina (program)  -- Regiomontanus' angle maximization problem  -- Region (model checking)  -- Region connection calculus  -- Regionalized variable theory  -- Register machine  -- Regnal number  -- Regression analysis  -- Regression Analysis of Time Series  -- Regression dilution  -- Regression discontinuity design  -- Regression fallacy  -- Regression-kriging  -- Regression toward the mean  -- Regression validation  -- Regressive discrete Fourier series  -- Regula falsi  -- Regular 4-polytope  -- Regular cardinal  -- Regular category  -- Regular chain  -- Regular complex polygon  -- Regular conditional probability  -- Regular constraint  -- Regular distribution (economics)  -- Regular Division of the Plane  -- Regular dodecahedron  -- Regular element  -- Regular element of a Lie algebra  -- Regular embedding  -- Regular extension  -- Regular Figures  -- Regular grammar  -- Regular graph  -- Regular grid  -- Regular Hadamard matrix  -- Regular homotopy  -- Regular icosahedron  -- Regular ideal  -- Regular isotopy  -- Regular local ring  -- Regular map  -- Regular map (graph theory)  -- Regular matrix  -- Regular matroid  -- Regular measure  -- Regular number  -- Regular numerical predicate  -- Regular open set  -- Regular p-group  -- Regular paperfolding sequence  -- Regular part  -- Regular polygon  -- Regular polyhedron  -- Regular polytope  -- Regular Polytopes (book)  -- Regular prime  -- Regular representation  -- Regular ring  -- Regular scheme  -- Regular semi-algebraic system  -- Regular semigroup  -- Regular sequence  -- Regular singular point  -- Regular skew apeirohedron  -- Regular skew polyhedron  -- Regular space  -- Regular surface  -- Regular tuning  -- Regularity structure  -- Regularity theorem  -- Regularity theorem for Lebesgue measure  -- Regularization (mathematics)  -- Regularization (physics)  -- Regularization by spectral filtering  -- Regularization perspectives on support vector machines  -- Regularized canonical correlation analysis  -- Regularized Gamma function  -- Regularized least squares  -- Regularized meshless method  -- Regularly ordered  -- Regulated function  -- Regulated integral  -- Regulus (geometry)  --

Rei
Reidemeister move  -- Reider's theorem  -- Reification (statistics)  -- Reilly formula  -- Reinforcement learning  -- Reinhardt cardinal  -- Reinhardt domain  -- Reisner Papyrus  -- Reiss relation  -- Rejecta Mathematica  -- Rejection sampling  -- Related rates  -- Relation (mathematics)  -- Relation algebra  -- Relation composition  -- Relation construction  -- Relational algebra  -- Relational calculus  -- Relational dependency network  -- Relational developmental systems  -- Relational model  -- Relational operator  -- Relationship between mathematics and physics  -- Relationship square  -- Relationships among probability distributions  -- Relative canonical model  -- Relative change and difference  -- Relative contact homology  -- Relative cycle  -- Relative dimension  -- Relative effective Cartier divisor  -- Relative homology  -- Relative interior  -- Relative neighborhood graph  -- Relative risk  -- Relative scalar  -- Relative term  -- Relatively compact subspace  -- Relatively hyperbolic group  -- Relativistic Breit–Wigner distribution  -- Relativistic chaos  -- Relativistic Euler equations  -- Relativistic heat conduction  -- Relativistic Lagrangian mechanics  -- Relativistic quantum mechanics  -- Relativistic system (mathematics)  -- Relaxation (approximation)  -- Relaxation (iterative method)  -- Relevance logic  -- Relevance vector machine  -- Reliability (statistics)  -- Reliability theory  -- Relief  -- Rellich–Kondrachov theorem  --

Rem
Remainder  -- Remak decomposition  -- Remarkable cardinal  -- Remarks on the Foundations of Mathematics  -- Remez algorithm  -- Remez inequality  -- Remmert–Stein theorem  -- Remote point  -- Removable singularity  -- Renard series  -- Rencontres numbers  -- Rendezvous problem  -- Rendiconti del Seminario Matematico della Università di Padova  -- Rendiconti del Seminario Matematico Università e Politecnico di Torino  -- Rendiconti di Matematica e delle sue Applicazioni  -- Renewal theory  -- Renormalization  -- Renormalization group  -- Rényi entropy  -- Rep-tile  -- Repdigit  -- Repeatability  -- Repeated measures design  -- Repeated median regression  -- Repeating decimal  -- Repetition code  -- Replacement product  -- Replacement theorem  -- Replica cluster move  -- Replicate (biology)  -- Replication (statistics)  -- Replicator equation  -- Reports on Mathematical Physics  -- Representable functor  -- Representation (mathematics)  -- Representation of a Lie group  -- Representation of a Lie superalgebra  -- Representation on coordinate rings  -- Representation rigid group  -- Representation ring  -- Representation theorem  -- Representation theory  -- Representation theory of diffeomorphism groups  -- Representation theory of finite groups  -- Representation theory of Hopf algebras  -- Representation theory of semisimple Lie algebras  -- Representation theory of SL2(R)  -- Representation theory of SU(2)  -- Representation theory of the Galilean group  -- Representation theory of the Lorentz group  -- Representation theory of the Poincaré group  -- Representation theory of the symmetric group  -- Representation up to homotopy  -- Representations of classical Lie groups  -- Representative function  -- Representer theorem  -- Reproducibility  -- Reproducibility Project  -- Reproducing kernel Hilbert space  -- Reptation Monte Carlo  -- Repunit  -- Repunit prime  --

Res
Resampling (statistics)  -- Rescaled range  -- Research in Number Theory  -- Research Institute for Advanced Studies  -- Research Institute for Mathematical Sciences  -- Research subject  -- Research Synthesis Methods  -- Reservoir sampling  -- Reshetikhin–Turaev invariant  -- Reshetnyak gluing theorem  -- Residual  -- Residual (numerical analysis)  -- Residual intersection  -- Residual neural network  -- Residual property  -- Residual property (mathematics)  -- Residual sum of squares  -- Residual time  -- Residual topology  -- Residual variance  -- Residually finite group  -- Residuated Boolean algebra  -- Residuated lattice  -- Residuated mapping  -- Residue (complex analysis)  -- Residue at infinity  -- Residue-class-wise affine group  -- Residue field  -- Residue number system  -- Residue theorem  -- Resistance distance  -- Resistive ballooning mode  -- Resolution (algebra)  -- Resolution (logic)  -- Resolution of singularities  -- Resolution proof compression by splitting  -- Resolution proof reduction via local context rewriting  -- Resolvable space  -- Resolvent (Galois theory)  -- Resolvent cubic  -- Resolvent formalism  -- Resolvent set  -- Resonance  -- Resource bounded measure  -- Resource contention  -- Resource-dependent branching process  -- Resource leak  -- Resource selection function  -- Response bias  -- Response modeling methodology  -- Response rate (survey)  -- Response surface methodology  -- Restricted Boltzmann machine  -- Restricted isometry property  -- Restricted Lie algebra  -- Restricted maximum likelihood  -- Restricted partial quotients  -- Restricted power series  -- Restricted product  -- Restricted randomization  -- Restricted representation  -- Restricted root system  -- Restricted sumset  -- Restriction (mathematics)  -- Resultant  -- Results in Mathematics  -- Resummation  --

Ret
Rethinking Mathematics  -- Retired number  -- Retract (group theory)  -- Retraction (topology)  -- Retrial queue  -- Return period  -- Reuleaux polygon  -- Reuleaux tetrahedron  -- Reuleaux triangle  -- Reuschle's theorem  -- Reverse Cuthill-McKee algorithm  -- Reverse-delete algorithm  -- Reverse divisible number  -- Reverse lookup  -- Reverse mathematics  -- Reverse Monte Carlo  -- Reverse perspective  -- Reverse Polish notation  -- Reverse-search algorithm  -- Reversed compound agent theorem  -- Reversible cellular automaton  -- Reversible diffusion  -- Reversible-jump Markov chain Monte Carlo  -- Reversible reference system propagation algorithm  -- Reviews in Mathematical Physics  -- Revised simplex method  -- Revista Colombiana de Estadística  -- Revolutions in Mathematics  -- REVSTAT  -- Rewrite order  -- Rewriting  --

Rex
Rexer's Annual Data Miner Survey  -- Reye configuration  -- Reynolds-averaged Navier–Stokes equations  -- Reynolds operator  -- Reynolds stress  -- Reynolds transport theorem  -- Rhetoric  -- Rhind Mathematical Papyrus  -- Rhind Mathematical Papyrus 2/n table  -- Rho calculus  -- Rhode Island Math League  -- Rhombic dodecahedral honeycomb  -- Rhombic dodecahedron  -- Rhombic enneacontahedron  -- Rhombic hectotriadiohedron  -- Rhombic hexecontahedron  -- Rhombic icosahedron  -- Rhombic triacontahedron  -- Rhombicosacron  -- Rhombicosahedron  -- Rhombicosidodecahedral prism  -- Rhombicosidodecahedron  -- Rhombicuboctahedral prism  -- Rhombicuboctahedron  -- Rhombidodecadodecahedron  -- Rhombille tiling  -- Rhombitetraheptagonal tiling  -- Rhombitetrapentagonal tiling  -- Rhombitriheptagonal tiling  -- Rhombitrihexagonal tiling  -- Rhombitrioctagonal tiling  -- Rhombohedron  -- Rhomboid  -- Rhombus  --

Rhu
Rhumb line  -- Ribbon (mathematics)  -- Ribbon category  -- Ribbon graph  -- Ribbon Hopf algebra  -- Ribbon knot  -- Ribenboim Prize  -- Ribet's lemma  -- Ribet's theorem  -- Riccati equation  -- Ricci calculus  -- Ricci curvature  -- Ricci decomposition  -- Ricci-flat manifold  -- Ricci flow  -- Ricci soliton  -- Rice distribution  -- Rice–Shapiro theorem  -- Rice's formula  -- Rice's theorem  -- Ricerche di Matematica  -- Richard Aaron  -- Richard Rusczyk  -- Richard von Mises Prize  -- Richard's paradox  -- Richards equation  -- Richardson Chair of Applied Mathematics  -- Richardson extrapolation  -- Richardson-Lucy deconvolution  -- Richardson's theorem  -- Richmond surface  -- Rickart space  -- Ricker model  -- Ricker wavelet  --

Rid
Ridders' method  -- Ridge (differential geometry)  -- Ridge detection  -- Ridge function  -- Ridge regression  -- Ridit scoring  -- Riemann curvature tensor  -- Riemann form  -- Riemann–Hilbert correspondence  -- Riemann–Hilbert problem  -- Riemann–Hurwitz formula  -- Riemann hypothesis  -- Riemann integral  -- Riemann invariant  -- Riemann–Lebesgue lemma  -- Riemann–Liouville integral  -- Riemann manifold  -- Riemann mapping theorem  -- Riemann Prize  -- Riemann problem  -- Riemann–Roch theorem  -- Riemann–Roch theorem for smooth manifolds  -- Riemann–Roch theorem for surfaces  -- Riemann–Roch-type theorem  -- Riemann series theorem  -- Riemann–Siegel formula  -- Riemann–Siegel theta function  -- Riemann–Silberstein vector  -- Riemann solver  -- Riemann sphere  -- Riemann–Stieltjes integral  -- Riemann sum  -- Riemann surface  -- Riemann–von Mangoldt formula  -- Riemann Xi function  -- Riemann zeta function  -- Riemann's differential equation  -- Riemann's minimal surface  -- Riemannian circle  -- Riemannian connection on a surface  -- Riemannian geometry  -- Riemannian manifold  -- Riemannian metric and Lie bracket in computational anatomy  -- Riemannian Penrose inequality  -- Riemannian submanifold  -- Riemannian submersion  -- Riesel number  -- Riesel Sieve  -- Riesz–Fischer theorem  -- Riesz function  -- Riesz–Markov–Kakutani representation theorem  -- Riesz mean  -- Riesz potential  -- Riesz projector  -- Riesz rearrangement inequality  -- Riesz representation theorem  -- Riesz sequence  -- Riesz space  -- Riesz theorem  -- Riesz–Thorin theorem  -- Riesz transform  -- Riesz's lemma  --

Rig
Rig category  -- Rigged Hilbert space  -- Right angle  -- Right conoid  -- Right-continuous filtration  -- Right group  -- Right half-plane  -- Right-hand rule  -- Right inverse  -- Right kite  -- Right prime  -- Right quotient  -- Right triangle  -- Right-truncatable prime  -- Rigid analytic space  -- Rigid body  -- Rigid body dynamics  -- Rigid category  -- Rigid cohomology  -- Rigid graph  -- Rigid origami  -- Rigid transformation  -- Rigidity (K-theory)  -- Rigidity (mathematics)  -- Rigidity matroid  -- Rigorous coupled-wave analysis  -- Rijndael MixColumns  -- Rijndael S-box  -- Ring (mathematics)  -- Ring class field  -- Ring extension  -- Ring homomorphism  -- Ring learning with errors  -- Ring lemma  -- Ring of integers  -- Ring of mixed characteristic  -- Ring of modular forms  -- Ring of polynomial functions  -- Ring of sets  -- Ring of symmetric functions  -- Ring spectrum  -- Ring theory  -- Ringed space  -- Ringed topos  -- Ringel–Hall algebra  --

Rio
Riordan array  -- Rippling  -- Rips machine  -- Risch algorithm  -- Rising sun lemma  -- Risk  -- Risk Analysis (journal)  -- Risk assessment  -- Risk-based authentication  -- Risk function  -- Risk-limiting audit  -- Risk-neutral measure  -- Risk of ruin  -- Risk perception  -- Risk theory  -- Rithmomachia  -- Ritz method  -- Rivista di Matematica della Università di Parma  -- Rivista italiana di economia demografia e statistica  -- Rivlin–Ericksen tensor  -- Rizza manifold  -- RL (complexity)  -- RMIT School of Science  -- Rng (algebra)  -- Road coloring theorem  -- ROAM  -- Robbins algebra  -- Robbins lemma  -- Robbins pentagon  -- Robbins problem  -- Robbins' problem  -- Robbins' theorem  -- Robert Anton Wilson  -- Robert Audi  -- Robertson graph  -- Robertson–Seymour theorem  -- Robertson–Wegner graph  -- Robin boundary condition  -- Robinson algorithm  -- Robinson arithmetic  -- Robinson–Schensted correspondence  -- Robinson–Schensted–Knuth correspondence  -- Robinson's joint consistency theorem  -- Robust Bayesian analysis  -- Robust control  -- Robust fuzzy programming  -- Robust geometric computation  -- Robust measures of scale  -- Robust optimization  -- Robust principal component analysis  -- Robust regression  -- Robust Regression and Outlier Detection  -- Robust statistics  -- Robustification  --

Roc
Rocha–Thatte cycle detection algorithm  -- Rock paper scissors  -- Rocket City Math League  -- Rocky Mountain Journal of Mathematics  -- Rod (unit)  -- Rod calculus  -- Rod group  -- Roderick Chisholm  -- Rodger's method  -- Rodrigues' formula  -- Rodrigues' rotation formula  -- Roe solver  -- Rogers polynomials  -- Rogers–Ramanujan continued fraction  -- Rogers–Ramanujan identities  -- Rogers–Szegő polynomials  -- Roitman's theorem  -- Rokhlin lemma  -- Rokhlin's theorem  -- Rolf Schock Prizes  -- Rolle's theorem  -- Romaka Siddhanta  -- Roman abacus  -- Roman dodecahedron  -- Roman numerals  -- Roman Opałka  -- Roman surface  -- Romanesco broccoli  -- Romanian Master of Mathematics and Sciences  -- Romanian numbers  -- Romanov's theorem  -- Romanovski polynomials  -- Romberg's method  --

Ron
Ronald Hugh Barker  -- Roof pitch  -- Roof tiles  -- Rook polynomial  -- Rook's graph  -- Room square  -- Root (mathematics) (disambiguation)  -- Root datum  -- Root extraction  -- Root-finding algorithms  -- Root locus  -- Root mean square  -- Root-mean-square deviation  -- Root-mean-square deviation of atomic positions  -- Root of a function  -- Root of unity  -- Root of unity modulo n  -- Root system  -- Root test  -- Rooted graph  -- Rooted product of graphs  -- Rope-burning puzzle  -- Ropelength  -- Rosati involution  -- Rose (mathematics)  -- Rose (topology)  -- Rose–Vinet equation of state  -- Rosenbrock function  -- Rosenbrock methods  -- Rosenbrock system matrix  -- Ross–Fahroo lemma  -- Ross–Fahroo pseudospectral method  -- Ross' π lemma  -- Ross's conjecture  -- Rosser's equation  -- Rosser's theorem  -- Rosser's trick  -- Rössler attractor  -- Rost invariant  --

Rot
Rot operator  -- Rota–Baxter algebra  -- Rota's basis conjecture  -- Rota's conjecture  -- Rotating calipers  -- Rotation  -- Rotation (mathematics)  -- Rotation around a fixed axis  -- Rotation formalisms in three dimensions  -- Rotation map  -- Rotation matrix  -- Rotation number  -- Rotation of axes  -- Rotation operator  -- Rotation system  -- Rotational invariance  -- Rotational–vibrational coupling  -- Rotations and reflections in two dimensions  -- Rotations in 4-dimensional Euclidean space  -- Roth's theorem  -- Rothamsted Experimental Station  -- Rothberger space  -- Rothe–Hagen identity  -- Rotor (mathematics)  -- Rotunda (geometry)  -- Rouché–Capelli theorem  -- Rouché's theorem  -- Rough number  -- Rough path  -- Rough set  -- Roulette (curve)  -- Round function  -- Round number  -- Round-off error  -- Round robin test  -- Roundel  -- Rounding  -- Rounding Errors in Algebraic Processes  -- Roundness  -- Rouse Ball Professor of Mathematics  -- Rouse History of Mathematics  -- Routh–Hurwitz stability criterion  -- Routh–Hurwitz theorem  -- Routh's theorem  -- Routhian mechanics  --

Row
Row and column spaces  -- Row and column vectors  -- Row echelon form  -- Row equivalence  -- Rowbottom cardinal  -- Royal Dutch Mathematical Society  -- Royal Spanish Mathematical Society  -- Royal Statistical Society  -- RP (complexity)  -- Rprop  -- RRQR factorization  -- RSA  -- RSA-100  -- RSA-1024  -- RSA-110  -- RSA-120  -- RSA-129  -- RSA-130  -- RSA-140  -- RSA-150  -- RSA-1536  -- RSA-155  -- RSA-160  -- RSA-170  -- RSA-180  -- RSA-190  -- RSA-200  -- RSA-2048  -- RSA-210  -- RSA-220  -- RSA-230  -- RSA-232  -- RSA-240  -- RSA-250  -- RSA-260  -- RSA-270  -- RSA-280  -- RSA-290  -- RSA-300  -- RSA-309  -- RSA-310  -- RSA-320  -- RSA-330  -- RSA-340  -- RSA-350  -- RSA-360  -- RSA-370  -- RSA-380  -- RSA-390  -- RSA-400  -- RSA-420  -- RSA-430  -- RSA-440  -- RSA-450  -- RSA-460  -- RSA-470  -- RSA-480  -- RSA-490  -- RSA-500  -- RSA-576  -- RSA-617  -- RSA-640  -- RSA-704  -- RSA-768  -- RSA-896  -- RSA Award for Excellence in Mathematics  -- RSA Factoring Challenge  -- RSA numbers  -- RSA problem  --

Rub
Rubik's Cube  -- Rubik's Cube group  -- Rubik's family cubes of all sizes  -- Rubik's Revenge  -- Rubin Causal Model  -- Rudin–Shapiro sequence  -- Rudin's conjecture  -- Rudvalis group  -- Ruelle zeta function  -- Ruffini's rule  -- Ruin theory  -- Rule complex  -- Rule of 72  -- Rule of division (combinatorics)  -- Rule of inference  -- Rule of marteloio  -- Rule of product  -- Rule of replacement  -- Rule of Sarrus  -- Rule of succession  -- Ruled join  -- Ruled surface  -- Ruled variety  -- Ruler  -- Ruler function  -- Rules for the Direction of the Mind  -- Rules of passage (logic)  -- Rulkov map  -- Rumi Numeral Symbols  -- Run-length encoding  -- Runcic 5-cubes  -- Runcic 6-cubes  -- Runcic 7-cubes  -- Runcicantellated 24-cell honeycomb  -- Runcicantellated tesseractic honeycomb  -- Runcicantitruncated tesseractic honeycomb  -- Runcinated 120-cells  -- Runcinated 16-cell honeycomb  -- Runcinated 24-cell honeycomb  -- Runcinated 24-cells  -- Runcinated 5-cell  -- Runcinated 5-cubes  -- Runcinated 5-orthoplexes  -- Runcinated 5-simplexes  -- Runcinated 6-cubes  -- Runcinated 6-orthoplexes  -- Runcinated 6-simplexes  -- Runcinated 7-cubes  -- Runcinated 7-orthoplexes  -- Runcinated 7-simplexes  -- Runcinated 8-simplexes  -- Runcinated tesseractic honeycomb  -- Runcinated tesseracts  -- Runcination  -- Runcitruncated tesseractic honeycomb  -- Runge–Kutta–Fehlberg method  -- Runge–Kutta method (SDE)  -- Runge–Kutta methods  -- Runge's phenomenon  -- Runge's theorem  -- Running total  --

Rup
Ruppeiner geometry  -- Ruppert's algorithm  -- Rupture field  -- Russell's paradox  -- Russian Mathematical Surveys  -- Russo–Dye theorem  -- Russo–Vallois integral  -- Ruth–Aaron pair  -- Ruth I. Michler Memorial Prize  -- Ruth Lyttle Satter Prize in Mathematics  -- Ruziewicz problem  -- Ruzsa–Szemerédi problem  -- Ruzzo–Tompa algorithm  -- RV coefficient  -- Rvachev function  -- RYB color model  -- Rybicki Press algorithm  -- Ryll-Nardzewski fixed-point theorem  -- Ryser's conjecture  -- Rytz's construction  -- Ryu–Takayanagi conjecture  --