Wikipedia:Reference desk/Archives/Mathematics/January 2010

= January 1 = Reference_desk/Archives/Mathematics/2010 January 1


 * 1) Maths - discovered or invented?

= January 2 = Reference_desk/Archives/Mathematics/2010 January 2


 * 1) Original Basic Discovery or No?
 * 2) How to factorise
 * 3) Geometric algebra question - involutions
 * 4) Proof of continuity
 * 5) What's a mathematical coincidence?

= January 3 = Reference_desk/Archives/Mathematics/2010 January 3


 * 1) Generalized Heat Equation
 * 2) Diffusion Equation
 * 3) Formal sums for quotients of primorials

= January 4 = Reference_desk/Archives/Mathematics/2010 January 4


 * 1) conversions
 * 2) Cantor's Ordinal Numbers
 * 3) Term by Term Integration of a Fourier Series
 * 4) Sums of squares
 * 5) Rates of decline
 * 6) jection

= January 5 = Reference_desk/Archives/Mathematics/2010 January 5


 * 1) Convergence
 * 2) Question on combinations
 * 3) Möbius Maps
 * 4) NP and NPC

= January 6 = Reference_desk/Archives/Mathematics/2010 January 6


 * 1) Predicting number of items in a set (statistics)
 * 2) division by zero
 * 3) Quotients and products of topological spaces.
 * 4) Limits
 * 5) Extension fields
 * 6) How to solve for B
 * 7) Logarithms and order of operations

= January 7 = Reference_desk/Archives/Mathematics/2010 January 7


 * 1) TI 84 plus calculator program

= January 8 = Reference_desk/Archives/Mathematics/2010 January 8


 * 1) Simple Mathematics, Requiring Data
 * 2) Differentiable?
 * 3) Number of partitions of a set in classes of given cardinalities.
 * 4) Letter grid problem
 * 5) Limits

= January 9 = Reference_desk/Archives/Mathematics/2010 January 9


 * 1) Arrow's impossibility theorem and real elections
 * 2) 1001 (number)
 * 3) Pairwise coprime integers
 * 4) calculating pi
 * 5) Standard deviation of 4 numbers

= January 10 = Reference_desk/Archives/Mathematics/2010 January 10


 * 1) Sum
 * 2) Harmonic series

= January 11 = Reference_desk/Archives/Mathematics/2010 January 11


 * 1) Perimeter of a trapezium
 * 2) Smoothness Scale In Number Theory

= January 12 = Reference_desk/Archives/Mathematics/2010 January 12


 * 1) Normal Closures Qual. Exam
 * 2) solution of differential equation of motion of a quarter car
 * 3) Locally invertible function from R^2 to R
 * 4) Estimating number ratios

= January 13 = Reference_desk/Archives/Mathematics/2010 January 13


 * 1) Cube root function on the space Mn of matrices
 * 2) finding the centre of a circle
 * 3) Nilpotent homomorphisms
 * 4) 35 degrees east

= January 14 = Reference_desk/Archives/Mathematics/2010 January 14


 * 1) An elementary homotopy equivalence
 * 2) Consecutive integers with same sum of proper divisors

= January 15 = Reference_desk/Archives/Mathematics/2010 January 15


 * 1) Is there a name for this property of sets?
 * 2) Is a set that contains only itself hereditary?
 * 3) Continuity of power functions
 * 4) Infinite ordinals
 * 5) Properties of certain symmetric matricies?

= January 17 = Reference_desk/Archives/Mathematics/2010 January 17


 * 1) Archimidean Spiral Segment
 * 2) Identity Matrix Multiplication
 * 3) Weird summation notation
 * 4) Certain repeating digits

= January 18 = Reference_desk/Archives/Mathematics/2010 January 18


 * 1) Asians
 * 2) differential
 * 3) What does this symbol/suffix mean?

= January 19 = Reference_desk/Archives/Mathematics/2010 January 19


 * 1) Policy recommendation for comparing citation totals or h-index for any mathematician
 * 2) Variation on equals sign
 * 3) P.G.F. question
 * 4) 3 rotations about the vertices of a triangle: identity map

= January 20 = Reference_desk/Archives/Mathematics/2010 January 20


 * 1) Eigenvalues and eigenvectors
 * 2) Riemann integral
 * 3) A few more geometry problems!
 * 4) Geometry question

= January 21 = Reference_desk/Archives/Mathematics/2010 January 21


 * 1) Riemannian geometry
 * 2) Fractional chromatic number
 * 3) Expected value problem
 * 4) can you explain turbo codes OR LDPC?

= January 22 = Reference_desk/Archives/Mathematics/2010 January 22


 * 1) Weaker versions of Fermat's Last Theorem
 * 2) Bounds

= January 23 = Reference_desk/Archives/Mathematics/2010 January 23


 * 1) Finding a surface on which integrals of multiple functions are 0

= January 24 = Reference_desk/Archives/Mathematics/2010 January 24


 * 1) Query on an online document - subgroups of A5
 * 2) College question: What material do I need to have a firm grasp on?
 * 3) Factoring Polynomials
 * 4) Complex icosidodecahedrons

= January 25 = Reference_desk/Archives/Mathematics/2010 January 25


 * 1) Cryptography
 * 2) Differential equation
 * 3) Topological Group Question

= January 26 = Reference_desk/Archives/Mathematics/2010 January 26


 * 1) Inverse Trigonometric Identity Prove
 * 2) Cross ratio equal to 1/2tan^2 of spherical distnce
 * 3) I was wondering...
 * 4) Normed Spaces
 * 5) A loxodromoid?

= January 27 = Reference_desk/Archives/Mathematics/2010 January 27


 * 1) Calculating the area of a triangle while on a coordinate system
 * 2) Effective procedure
 * 3) Three little geometry puzzles
 * 4) sequence space
 * 5) Smooth structures (manifolds)
 * 6) Another triangle problem
 * 7) How to build an ellipse?

= January 28 = Reference_desk/Archives/Mathematics/2010 January 28


 * 1) Golden Ratio
 * 2) Reversion to the mean
 * 3) NP definition
 * 4) j-invariant

= January 29 = Reference_desk/Archives/Mathematics/2010 January 29


 * 1) Why is the perimeter of a spherical triangle less than 2 pi?
 * 2) Unique bid auctions
 * 3) Cardinality
 * 4) ratio inequality
 * 5) What algorithm?
 * 6) Proof
 * 7) Derivative question
 * 8) Monty hall paradox

= January 30 = Reference_desk/Archives/Mathematics/2010 January 30


 * 1) percentages,round offs and number based systerms
 * 2) could there be ANY change made in the rules of logic without immediate inconsistency?
 * 3) Hexadecimal

= January 31 = Reference_desk/Archives/Mathematics/2010 January 31


 * 1) Normal vectors
 * 2) Rhombicosidodecahedron
 * 3) Strange use of log
 * 4) Function harmonic on a strip
 * 5) Intersecting cylinders
 * 6) What is the link between the edges, faces and vertices of a 3D shape?