Wikipedia:Reference desk/Archives/Mathematics/March 2011

= March 1 = Reference_desk/Archives/Mathematics/2011 March 1


 * 1) Value of delta
 * 2) Self-homeomorphisms and fundamental groups

= March 2 = Reference_desk/Archives/Mathematics/2011 March 2


 * 1) "Common" log?
 * 2) Weird Latex behavior
 * 3) Fourier Transform

= March 3 = Reference_desk/Archives/Mathematics/2011 March 3


 * 1) Maths competition (again)
 * 2) Mathematician "Sura man chi" (phonetic)
 * 3) How can I find values that give the least bad values for these expressions?
 * 4) Basic combinatorics problem

= March 4 = Reference_desk/Archives/Mathematics/2011 March 4


 * 1) Half way between infinities
 * 2) Conjugate Variables

= March 5 = Reference_desk/Archives/Mathematics/2011 March 5


 * 1) What's the symbol that means "repeat this function"? And what's the process called?
 * 2) Maths with Intensive and extensive properties
 * 3) Numerical Integration problem

= March 6 = Reference_desk/Archives/Mathematics/2011 March 6


 * 1) Trig identities
 * 2) A simple-looking but not easy equation
 * 3) Quick query - showing a simplicial complex has trivial 2nd Homology group

= March 7 = Reference_desk/Archives/Mathematics/2011 March 7


 * 1) detecting clumps in weighted graph

= March 8 = Reference_desk/Archives/Mathematics/2011 March 8


 * 1) Points within a fixed hyperbolic distance of a geodesic in the unit disc B^2 and unit ball B^3
 * 2) Tensor Question

= March 9 = Reference_desk/Archives/Mathematics/2011 March 9


 * 1) Identifying "off" values from how well data fit a reference
 * 2) (x+1)^x
 * 3) Compact surface & Gaussian curvature
 * 4) Rounding off
 * 5) Which number is larger?

= March 11 = Reference_desk/Archives/Mathematics/2011 March 11


 * 1) Suffix notation

= March 12 = Reference_desk/Archives/Mathematics/2011 March 12


 * 1) Random reverse Polish notation question
 * 2) Flipping coins
 * 3) Linear Algebra help

= March 13 = Reference_desk/Archives/Mathematics/2011 March 13


 * 1) Matrices Question
 * 2) Calculation of s in Lucas–Lehmer primality test
 * 3) Multinomial terms
 * 4) Form work of Plinth Beam   or   Shuttering of Plinth Beam
 * 5) Quadratic Forms
 * 6) recent old SAT I exams

= March 14 = Reference_desk/Archives/Mathematics/2011 March 14


 * 1) complex analysis
 * 2) Quick identification of outliers
 * 3) Power Series
 * 4) Problem with completing the square

= March 15 = Reference_desk/Archives/Mathematics/2011 March 15


 * 1) Martingales & Optional Sampling Theorem
 * 2) Singular value decomposition
 * 3) Latex Pictures
 * 4) Expression for partial sums of sequence
 * 5) Calculator
 * 6) powerball jackpot
 * 7) Continuous compound interest
 * 8) Bayesian probability

= March 16 = Reference_desk/Archives/Mathematics/2011 March 16


 * 1) 2nd order difference equations vs 2nd order differential Equations
 * 2) Probability

= March 17 = Reference_desk/Archives/Mathematics/2011 March 17


 * 1) Derivatives
 * 2) Monty Hall problem implications
 * 3) Invariance of Differential Forms
 * 4) Binary operation
 * 5) Rigorous theory of "div, grad, curl, and all that"

= March 18 = Reference_desk/Archives/Mathematics/2011 March 18


 * 1) Calculus theorems
 * 2) Unrecognised mathematical notation
 * 3) Tensors
 * 4) Converting a Difference in GPS co-ordinates to a distance?
 * 5) Permutation group with the greatest orbit
 * 6) Is (3x^(1/3))(e^x-1) differentiable at zero?
 * 7) Periods
 * 8) Finance Question about Bond Prices and Compounded Interest Rates

= March 19 = Reference_desk/Archives/Mathematics/2011 March 19


 * 1) Separating variables in a poly nomail in  multivariables
 * 2) Linear equation system with two solutions
 * 3) homomorphism from S4 to S3
 * 4) Calculating one variable from six others

= March 20 = Reference_desk/Archives/Mathematics/2011 March 20


 * 1) Trigonometric distribution
 * 2) Longest Straight Lines Across States?
 * 3) Limits questions

= March 21 = Reference_desk/Archives/Mathematics/2011 March 21


 * 1) Clopen, non-empty, proper subsets of R

= March 22 = Reference_desk/Archives/Mathematics/2011 March 22


 * 1) Vectors
 * 2) Min/max value of a vector equation

= March 23 = Reference_desk/Archives/Mathematics/2011 March 23


 * 1) Injective function
 * 2) Curve Length of Cubic Bezier Curves
 * 3) Automorphism groups
 * 4) M67 and years taken to find its factors by Cole

= March 24 = Reference_desk/Archives/Mathematics/2011 March 24


 * 1) Large Powers
 * 2) Latex-amsproc-paperwidth
 * 3) Differential Equation
 * 4) Mathematical morphology notation in research paper
 * 5) Simultaneous equation

= March 25 = Reference_desk/Archives/Mathematics/2011 March 25


 * 1) Figuring out percentages
 * 2) Erdős–Graham problem
 * 3) Variance of matrix-valued random variables
 * 4) Power series
 * 5) Monoid ring

= March 27 = Reference_desk/Archives/Mathematics/2011 March 27


 * 1) 2 Questions related to  'Grids' (from a math perspective)
 * 2) Laplace Transforms
 * 3) Solution curves
 * 4) Fourier Transform

= March 28 = Reference_desk/Archives/Mathematics/2011 March 28


 * 1) Even and odd permutations
 * 2) Delay Differential Equations of the Retarded Type
 * 3) Physics of insect wings
 * 4) confusion regarding the definition of sample space.

= March 29 = Reference_desk/Archives/Mathematics/2011 March 29


 * 1) Solving a game with randomness/imperfect information
 * 2) 56% of an area is allocated. It is increased to 78% of the original area.  This is n% more than the original allocation?
 * 3) Fundmental Theorem of Algebra
 * 4) Broken circle

= March 30 = Reference_desk/Archives/Mathematics/2011 March 30


 * 1) Wing (insect)
 * 2) Definition of a polynomial
 * 3) Row echelon form
 * 4) Geometry term ?

= March 31 = Reference_desk/Archives/Mathematics/2011 March 31


 * 1) Jacobian matrix and determinant
 * 2) stock growth
 * 3) Multiplicative Maps Matrices to Reals
 * 4) inequalities for simplices?
 * 5) Published proof that there are only 5 regular polyhedra
 * 6) Cycling theorem in linear programming
 * 7) Fundamental Theorem of Algebra again