Wikipedia:Reference desk/Archives/Mathematics/January 2013

= January 1 = Reference_desk/Archives/Mathematics/2013 January 1


 * 1) Archimedes uses time machine to beat Lambert
 * 2) SOLVING ALL POLYNOMIALS BY RADICALS
 * 3) matrix

= January 2 = Reference_desk/Archives/Mathematics/2013 January 2


 * 1) Srinivasa Ramanujan's deathbed theory solved after 100 years
 * 2) Concave quadrilateral requirement?
 * 3) my hat, your hat, quantum entanglement, and OTP

= January 3 = Reference_desk/Archives/Mathematics/2013 January 3


 * 1) Low-probability high-payoff events
 * 2) optimization and regularization!
 * 3) Decomposing hermitian matrix into rank-one matrices
 * 4) Cell phone pre-paid card optimization

= January 4 = Reference_desk/Archives/Mathematics/2013 January 4


 * 1) Starting hand matchups in Texas holdem

= January 5 = Reference_desk/Archives/Mathematics/2013 January 5


 * 1) Finite generation of ideal
 * 2) Identities true for only small (square) matrices

= January 6 = Reference_desk/Archives/Mathematics/2013 January 6


 * 1) abelian groups: dual group induces dual group of subgroup by restricting
 * 2) Problem with editting an article based on one's own published paper?

= January 9 = Reference_desk/Archives/Mathematics/2013 January 9


 * 1) How to prove the commutative property?
 * 2) modulus/cardanality
 * 3) Matrix inversions

= January 10 = Reference_desk/Archives/Mathematics/2013 January 10


 * 1) How low can you go?
 * 2) Trying to Calculate my Class Rank
 * 3) Topics more tougher than calculus
 * 4) Dirichlet distribution
 * 5) Base 10, 11 and fingers question.
 * 6) Rotation of arbitrary coordinate systems
 * 7) regression for data that is a power function: copied from Miscellaneous desk

= January 11 = Reference_desk/Archives/Mathematics/2013 January 11


 * 1) Converting this to an integrable form
 * 2) Heuristic argument for expected number of solutions to specific congruence
 * 3) Chances of counter-intuitive results from a betting system
 * 4) Base pi

= January 12 = Reference_desk/Archives/Mathematics/2013 January 12


 * 1) Computing the CDF of the Student's T-distribution
 * 2) π = √10?
 * 3) Sum of products
 * 4) would it be a proof by construction of the possible existence of God?

= January 15 = Reference_desk/Archives/Mathematics/2013 January 15


 * 1) Empty Sets and Neighbourhoods definition of a Topological Space
 * 2) Hypergeometric function
 * 3) Calculating the multiplicative order
 * 4) Trouble Reading an Article

= January 16 = Reference_desk/Archives/Mathematics/2013 January 16


 * 1) How many "non-trivially distinct" Gray codes of a given alphabet size and codeword length exist?

= January 17 = Reference_desk/Archives/Mathematics/2013 January 17


 * 1) Riemann hypothesis for curves over finite fields
 * 2) algebra word problems
 * 3) Undecidability of the Collatz conjecture
 * 4) What is radius of equilateral polygon?

= January 18 = Reference_desk/Archives/Mathematics/2013 January 18


 * 1) Blackjack
 * 2) number of subgroups
 * 3) Visual Multiplication with Lines
 * 4) Amount of starter positions possible in those random chess variants.

= January 19 = Reference_desk/Archives/Mathematics/2013 January 19


 * 1) Riemann hypothesis for curves over finite fields
 * 2) prime ideal extension and contraction
 * 3) Running time of APR-CL
 * 4) Estimating a categorical distribution
 * 5) Geometric figure Extension.
 * 6) Independence number of graph: bound similar to Lovasz number?

= January 20 = Reference_desk/Archives/Mathematics/2013 January 20


 * 1) Integral

= January 21 = Reference_desk/Archives/Mathematics/2013 January 21


 * 1) Lanchester Square Law
 * 2) 3 3's

= January 22 = Reference_desk/Archives/Mathematics/2013 January 22


 * 1) calculus
 * 2) MDAS method
 * 3) Examples of (1+1/n)^n in nature.
 * 4) Why only one real cube root?

= January 23 = Reference_desk/Archives/Mathematics/2013 January 23


 * 1) website regarding numbers like 13.7 billion
 * 2) Is there a closed form expression for this quantity?

= January 24 = Reference_desk/Archives/Mathematics/2013 January 24


 * 1) Chicken-and-Egg Problem
 * 2) traditional limit definition of continuity implies topological definition
 * 3) Complex numbers

= January 25 = Reference_desk/Archives/Mathematics/2013 January 25


 * 1) Trapezoid
 * 2) Limit
 * 3) Probability question - SSN/DOB

= January 26 = Reference_desk/Archives/Mathematics/2013 January 26


 * 1) Ehrenfeucht Fraisse Games
 * 2) An arithmetico-geometric series?
 * 3) Maclaurin series question
 * 4) monad or not?
 * 5) math problem

= January 27 = Reference_desk/Archives/Mathematics/2013 January 27


 * 1) Limit 2
 * 2) continuous compounding formula derivation proof

= January 28 = Reference_desk/Archives/Mathematics/2013 January 28


 * 1) outer automorphisms

= January 29 = Reference_desk/Archives/Mathematics/2013 January 29


 * 1) Proof of existence would be a useful start
 * 2) Generalizing integral
 * 3) trial and error method
 * 4) Value of pi

= January 30 = Reference_desk/Archives/Mathematics/2013 January 30


 * 1) Generalization of integral 2

= January 31 = Reference_desk/Archives/Mathematics/2013 January 31


 * 1) Curious Sample Spaces
 * 2) Probability question