Wikipedia:Reference desk/Archives/Mathematics/August 2009

= August 1 = Reference_desk/Archives/Mathematics/2009 August 1


 * 1) computing modulo
 * 2) Working together word problem
 * 3) Two cubes that share three corners

= August 2 = Reference_desk/Archives/Mathematics/2009 August 2


 * 1) Image of a set of measure 0
 * 2) Normal distribution and chi-square test project - Please help
 * 3) 0 expected value of a bet = impossible to make money (guaranteed)?  why?

= August 3 = Reference_desk/Archives/Mathematics/2009 August 3


 * 1) how many ways are there of arranging 8 pairs of socks on a clothesline so that no two socks from a pair are next to each other?
 * 2) what is a quarternion?
 * 3) Another lovely complex integral

= August 4 = Reference_desk/Archives/Mathematics/2009 August 4


 * 1) Pseudoscalar
 * 2) Showing a function is right continuous
 * 3) Solving a system of matrix equations
 * 4) What angle do you need to get a certain length of an arc?
 * 5) 4D analog of a 3D cross-product.

= August 5 = Reference_desk/Archives/Mathematics/2009 August 5


 * 1) A question about geographical coordinates and significant digits
 * 2) Mandelbrot set
 * 3) twice as wide
 * 4) Gravity and Mass

= August 6 = Reference_desk/Archives/Mathematics/2009 August 6


 * 1) Rational function?
 * 2) Matrix function
 * 3) Easy contour integral
 * 4) Another integral
 * 5) The math behind general relativity

= August 7 = Reference_desk/Archives/Mathematics/2009 August 7


 * 1) Inferior goods and recessions
 * 2) Line -> Triangle -> Pyramid -> ?

= August 8 = Reference_desk/Archives/Mathematics/2009 August 8


 * 1) Alternative proof that a square matrix is similar to its transpose
 * 2) Absolute Values with Factorials
 * 3) Set of points with density 1

= August 9 = Reference_desk/Archives/Mathematics/2009 August 9


 * 1) Constructing Triangles
 * 2) the 24 cells of the 24-cell and their intersections
 * 3) Functional square root
 * 4) Finding a Permutation Matrix

= August 10 = Reference_desk/Archives/Mathematics/2009 August 10


 * 1) TeX help
 * 2) Time Simulation in Matlab
 * 3) Complex integration

= August 11 = Reference_desk/Archives/Mathematics/2009 August 11


 * 1) Integral
 * 2) Lottery odds
 * 3) Parametrisation

= August 12 = Reference_desk/Archives/Mathematics/2009 August 12


 * 1) Using the δ/ε method to show that lim(x→0) of 1/x does not exist
 * 2) Random Walk
 * 3) Using the identity theorem

= August 13 = Reference_desk/Archives/Mathematics/2009 August 13


 * 1) Absolute continuity
 * 2) Radius and Volume
 * 3) ordered sets and order types
 * 4) Vogel's approximate method
 * 5) Sudoku Puzzles

= August 14 = Reference_desk/Archives/Mathematics/2009 August 14


 * 1) Infinity--Question/comment/request for comments
 * 2) Regifting Robin
 * 3) Showcase Showdown strategy
 * 4) What's the difference?
 * 5) Lipschitz, absolute continuity
 * 6) Measurable functions/Derivatives

= August 15 = Reference_desk/Archives/Mathematics/2009 August 15


 * 1) L^p(R^n) limit
 * 2) N disjoint solutions to N-queens puzzle
 * 3) What is summation of r! from r=1 to r=n?
 * 4) Differential definition
 * 5) Ricci Tensor
 * 6) P(n+1) more likely to be prime if P(n) is?

= August 16 = Reference_desk/Archives/Mathematics/2009 August 16


 * 1) Bounded linear operator on sigma-finite measure space
 * 2) Entropy
 * 3) Please fill the gaps in a table
 * 4) Learning about multiple regression online
 * 5) Uniformly convergent sequence of polynomials

= August 17 = Reference_desk/Archives/Mathematics/2009 August 17


 * 1) Tuk-tuks
 * 2) QQ vs. YoY
 * 3) quick maths question
 * 4) How many eighth degree monic polynomials are such that...
 * 5) question about probability
 * 6) round robin tournament

= August 18 = Reference_desk/Archives/Mathematics/2009 August 18


 * 1) Combinatorics question
 * 2) Limit of integral

= August 19 = Reference_desk/Archives/Mathematics/2009 August 19


 * 1) Is this polynomial most extreme?
 * 2) Vector perpendicular to plane

= August 21 = Reference_desk/Archives/Mathematics/2009 August 21


 * 1) Quadratic turd
 * 2) Significant digits

= August 23 = Reference_desk/Archives/Mathematics/2009 August 23


 * 1) Pi
 * 2) Lagrangian is invariant
 * 3) Proof?
 * 4) Average
 * 5) A game with positions expressable as vectors
 * 6) BN-pairs: conjugate generators weyl group give double cosets of same size

= August 24 = Reference_desk/Archives/Mathematics/2009 August 24


 * 1) Probability
 * 2) General formula for power sum
 * 3) Greater, lesser or non-comparable

= August 25 = Reference_desk/Archives/Mathematics/2009 August 25


 * 1) Topology
 * 2) The real numbers and subsets of the natural numbers
 * 3) Is this correct?
 * 4) fibonacci spiral

= August 26 = Reference_desk/Archives/Mathematics/2009 August 26


 * 1) Computer-aided proofs since Appel-Haken
 * 2) Definition of Kähler manifolds
 * 3) can u solve this
 * 4) Commutivity of addition
 * 5) Associativity of composition

= August 27 = Reference_desk/Archives/Mathematics/2009 August 27


 * 1) A weird thing
 * 2) Uncountability of R
 * 3) Is .99999999999 repeating=1?
 * 4) Line bundles and cohomology
 * 5) What is an axiom?
 * 6) Diophantine variances

= August 28 = Reference_desk/Archives/Mathematics/2009 August 28


 * 1) Automorphisms
 * 2) Nonconvex polyhedra
 * 3) nested gaussian integrals.

= August 29 = Reference_desk/Archives/Mathematics/2009 August 29


 * 1) Why use Poisson distribution as an approximation to binomial?
 * 2) The Tychonoff theorem
 * 3) Question about sets
 * 4) Average Value of a Function
 * 5) Fun little problem
 * 6) Fun little macro with a (math) issue...

= August 30 = Reference_desk/Archives/Mathematics/2009 August 30


 * 1) Principle of  mathematical induction
 * 2) Big O of sin x
 * 3) What mathematics things are vs. what mathematical things do
 * 4) PUZZLING PUZZLE
 * 5) Sudoku boards and groups with 9 elements
 * 6) Random trig question

= August 31 = Reference_desk/Archives/Mathematics/2009 August 31


 * 1) Empty set and phi
 * 2) Method of Characteristics to solve PDEs
 * 3) Sequence limit
 * 4) Millimeters
 * 5) Octahemioctahedron
 * 6) Thank you, math reference desk
 * 7) Weighted sum of distance from a curvy line