Wikipedia:Reference desk/Archives/Mathematics/October 2009

= October 1 = Reference_desk/Archives/Mathematics/2009 October 1


 * 1) The answer to this system of equations?
 * 2) type 1 and 2 errors of statistical hypothesis testing
 * 3) Limits on discrete sets
 * 4) P value

= October 2 = Reference_desk/Archives/Mathematics/2009 October 2


 * 1) Collatz conjecture
 * 2) Theorem
 * 3) Achilles numbers: Never consecutive?
 * 4) Question about shoelaces

= October 3 = Reference_desk/Archives/Mathematics/2009 October 3


 * 1) Calculator
 * 2) Calculator (solution)
 * 3) Rectangle under pinhole projection

= October 4 = Reference_desk/Archives/Mathematics/2009 October 4


 * 1) Math
 * 2) trigonometry
 * 3) Best way to calculate if a line crosses another line, or a polygon.
 * 4) Powerful numbers

= October 5 = Reference_desk/Archives/Mathematics/2009 October 5


 * 1) Odds ratio vs. relative risk
 * 2) dx
 * 3) Constant Morphisms
 * 4) Proving the existence of a function
 * 5) Fourier Series Representation

= October 6 = Reference_desk/Archives/Mathematics/2009 October 6


 * 1) Question on topological manifolds
 * 2) Geometry

= October 7 = Reference_desk/Archives/Mathematics/2009 October 7


 * 1) Integration  by  Substitution
 * 2) solving mathematical problems
 * 3) Probability question

= October 9 = Reference_desk/Archives/Mathematics/2009 October 9


 * 1) Double check logic on this permutation question

= October 10 = Reference_desk/Archives/Mathematics/2009 October 10


 * 1) Linear map
 * 2) Number Theory
 * 3) Do the intuitionists agree that an equation of the form (x &minus; a)(x &minus; b) = 0 has two solutions only?

= October 12 = Reference_desk/Archives/Mathematics/2009 October 12


 * 1) Sphere volume and surface area
 * 2) Ring Extension
 * 3) Cardinality
 * 4) Curve fitting
 * 5) Interesting sounds
 * 6) No solutions to equation similar to FLT
 * 7) Markov chain-like model
 * 8) What is a Mexican pyramid?

= October 13 = Reference_desk/Archives/Mathematics/2009 October 13


 * 1) Vectors and matrix algebra dot products et al
 * 2) An Almost-Primality Test
 * 3) Vectors in meterology
 * 4) percent comparisons
 * 5) Some probability questions...

= October 14 = Reference_desk/Archives/Mathematics/2009 October 14


 * 1) Constructor
 * 2) Polynomial ideals
 * 3) Newton's Method
 * 4) Russell's paradox
 * 5) Lottery: 6 numbers out of 49, expected values in case of large jackpots

= October 15 = Reference_desk/Archives/Mathematics/2009 October 15


 * 1) simple formula for fractions in computer code

= October 16 = Reference_desk/Archives/Mathematics/2009 October 16


 * 1) cbse mathematics question papers
 * 2) The Limiting Function of a Fourier Series

= October 17 = Reference_desk/Archives/Mathematics/2009 October 17


 * 1) Quadratic forms on real matrices
 * 2) Good way to remember meet vs join?
 * 3) Certain conformal map projections

= October 18 = Reference_desk/Archives/Mathematics/2009 October 18


 * 1) Getting pi with a limit
 * 2) Application of the PNT to a sequence of numbers
 * 3) Can kite be a trapezium?
 * 4) Smallest number which have the first n positive integers as divisors
 * 5) Modular forms: Finding the fundamental domain for a finite index subgroup
 * 6) Use of abacus in United States education

= October 19 = Reference_desk/Archives/Mathematics/2009 October 19


 * 1) Euclidean scaling

= October 20 = Reference_desk/Archives/Mathematics/2009 October 20


 * 1) Ergodic splitting in Lp
 * 2) Common Complementary subspaces in finite dimensional vector spaces
 * 3) Word Probability Question
 * 4) homework help plz?
 * 5) 2D splines

= October 21 = Reference_desk/Archives/Mathematics/2009 October 21


 * 1) Extension of the Bateman-Horn conjecture to subsets
 * 2) Ostrowski
 * 3) I am really intersted in mathematitics adnd solving questions is one step ahead. However I've always got problems here and there as below
 * 4) QUADRATIC EQUATION
 * 5) History of Mathematical Thought on Base Ten

= October 22 = Reference_desk/Archives/Mathematics/2009 October 22


 * 1) Theorem that says that valency maximal distance of distance-regular graph is "very very big"?
 * 2) how many articles should I read?
 * 3) Multiple integral
 * 4) Exponential random variable probability

= October 23 = Reference_desk/Archives/Mathematics/2009 October 23


 * 1) Binary trees and transient Markov Chains
 * 2) The Frustrating Integral
 * 3) Peano axiom of induction
 * 4) statistics problem

= October 24 = Reference_desk/Archives/Mathematics/2009 October 24


 * 1) Groups of order 112
 * 2) Subset of an intersection
 * 3) Grades formula
 * 4) Equalities of means

= October 25 = Reference_desk/Archives/Mathematics/2009 October 25


 * 1) Hierarchical probability model
 * 2) Pyramids
 * 3) Invariant Reliabilty Index (ϐ)

= October 26 = Reference_desk/Archives/Mathematics/2009 October 26


 * 1) Logs
 * 2) Diagonalise these 2 QFs at once - must be going wrong somewhere
 * 3) 0.9...
 * 4) Domains wot change

= October 27 = Reference_desk/Archives/Mathematics/2009 October 27


 * 1) Is there an Erdős–Ko–Rado theorem for binary codes?
 * 2) Calculating a chord of a sphere
 * 3) Irrational exponents
 * 4) Power set of a Cartesian product
 * 5) BMO-style question (ish) on sums & products
 * 6) Any method for solving the following equation...

= October 29 = Reference_desk/Archives/Mathematics/2009 October 29


 * 1) Differential operators of order 4 - help me before I die of boredom
 * 2) Logarithmic differentiation
 * 3) help this formulae identify itself
 * 4) Algebraic long division

= October 30 = Reference_desk/Archives/Mathematics/2009 October 30


 * 1) Piping a pump/filter for minimum number of valves
 * 2) probability question
 * 3) Finding global maximum
 * 4) Intervals of real numbers
 * 5) While we're talking about intervals...
 * 6) Degenerate conics
 * 7) Simple geometrical question