Wikipedia:Reference desk/Archives/Mathematics/September 2010

= September 1 = Reference_desk/Archives/Mathematics/2010 September 1


 * 1) Rotation matrix: counterclockwise vs. clockwise
 * 2) Convert procedure to formula?
 * 3) Another number theory problem
 * 4) Name of a curve

= September 2 = Reference_desk/Archives/Mathematics/2010 September 2


 * 1) find scalar values a, b and c
 * 2) Numerical analysis notation
 * 3) Drawing 45-45-90 triangles on spheres

= September 3 = Reference_desk/Archives/Mathematics/2010 September 3


 * 1) Standard deviation
 * 2) Random variables
 * 3) Formula images
 * 4) Homogeneous polynomials

= September 4 = Reference_desk/Archives/Mathematics/2010 September 4


 * 1) Need a better parametric test for a sine-wave distribution.
 * 2) When to use Kendall / Spearman correlations instead of Pearson's?
 * 3) What is the test of statistical significance for nominal variables?

= September 5 = Reference_desk/Archives/Mathematics/2010 September 5


 * 1) Question on polynomials
 * 2) Jensen's inequality?
 * 3) Limit Question
 * 4) dL

= September 6 = Reference_desk/Archives/Mathematics/2010 September 6


 * 1) Proving the sequence defining e converges
 * 2) The Space of Oriented Geodesics
 * 3) big-O?

= September 7 = Reference_desk/Archives/Mathematics/2010 September 7


 * 1) What does this expression count?
 * 2) Good grief, not another homework question
 * 3) Dixon's Method of Factorization

= September 8 = Reference_desk/Archives/Mathematics/2010 September 8


 * 1) Σ and ʃ

= September 9 = Reference_desk/Archives/Mathematics/2010 September 9


 * 1) Atmospheric carbon scenario difference projections again
 * 2) Fitting a parabola and Euler's theorem
 * 3) Underline notation for n!/(n-k)!
 * 4) SVD and Polysemy
 * 5) Radom number generation
 * 6) Truncated lognormal distribution
 * 7) Finding Remainder using Scientific Cal?
 * 8) e-values and e-vectors of a transition matrix

= September 11 = Reference_desk/Archives/Mathematics/2010 September 11


 * 1) Markov chains
 * 2) basic probability / stats question
 * 3) Graph of x^2 + y^2 = 1
 * 4) Evaluating a sum
 * 5) A Simple Random Walk
 * 6) Special Orthogonal Group
 * 7) Divergence Theorem
 * 8) Tabular method of integration by parts

= September 12 = Reference_desk/Archives/Mathematics/2010 September 12


 * 1) Laplace's Equation
 * 2) Polynomial division
 * 3) Summation Convention
 * 4) Probability Question

= September 13 = Reference_desk/Archives/Mathematics/2010 September 13


 * 1) exponents
 * 2) Inverse function
 * 3) Math

= September 14 = Reference_desk/Archives/Mathematics/2010 September 14


 * 1) Vector as an integrand
 * 2) Vector Problem
 * 3) Orthogonality of Fourier basis for L2[R]
 * 4) Octahedral Symmetry

= September 15 = Reference_desk/Archives/Mathematics/2010 September 15


 * 1) 3rd Axiom of Probability
 * 2) Polynomial Achieving Infimum
 * 3) Box-Muller Transformation
 * 4) Riemann Zeta Function
 * 5) Synthetic division

= September 16 = Reference_desk/Archives/Mathematics/2010 September 16


 * 1) Semisimple modules completely determined by character trace map?
 * 2) Rado numbers
 * 3) Surface Normal

= September 17 = Reference_desk/Archives/Mathematics/2010 September 17


 * 1) Probability distribution with kurtosis parameter
 * 2) Countability
 * 3) A proof that in euclidean space pi is a constant.
 * 4) Request for statistics article review

= September 18 = Reference_desk/Archives/Mathematics/2010 September 18


 * 1) Finding maximum clique in a largish graph
 * 2) Placing equally spaced vertices in a curve (but not based on arc length)
 * 3) Casimir Operator
 * 4) Inequality question- For which values of k does the inequality hold for all real values of x?
 * 5) Every real/complex algebra, generated by real-symmetric matrices is semisimple?
 * 6) American Mathematicians
 * 7) Index of a subgroup
 * 8) Base and mod, 2 qs
 * 9) Higher Dimensional Results
 * 10) Rado's theorem doubt

= September 19 = Reference_desk/Archives/Mathematics/2010 September 19


 * 1) Expression of  a rational number in powers of p
 * 2) Is every permutation group decomposable into a group direct product of cyclic subgroups
 * 3) braids, knots, and links

= September 20 = Reference_desk/Archives/Mathematics/2010 September 20


 * 1) Your article

= September 21 = Reference_desk/Archives/Mathematics/2010 September 21


 * 1) Projectile Motion problem
 * 2) Integration by Parts
 * 3) Asymptote and limit

= September 22 = Reference_desk/Archives/Mathematics/2010 September 22


 * 1) quantifier depth examples
 * 2) Instantaneous Acceleration/Uniform Circular Motion
 * 3) Determining a volunteering shift
 * 4) defining a function
 * 5) Zero polynomial

= September 23 = Reference_desk/Archives/Mathematics/2010 September 23


 * 1) Mystery trig identity

= September 24 = Reference_desk/Archives/Mathematics/2010 September 24


 * 1) Limit
 * 2) Using 2d complex vectors to represent 4d space
 * 3) Is there a way to analytically find the inverse of y=x^x on [1,∞)?
 * 4) Stirling's approximation
 * 5) Learn Calculus

= September 25 = Reference_desk/Archives/Mathematics/2010 September 25


 * 1) Calculating powers of one polynomial modulo another efficiently over GF(p)
 * 2) Limit question

= September 26 = Reference_desk/Archives/Mathematics/2010 September 26


 * 1) Limit of sum
 * 2) Function
 * 3) Numerical precision limitations on matrix inverses

= September 27 = Reference_desk/Archives/Mathematics/2010 September 27


 * 1) Elevator, Force/Mass question
 * 2) Volume of a cone

= September 28 = Reference_desk/Archives/Mathematics/2010 September 28


 * 1) Polynomials and symmetries
 * 2) Generalization of cut and choose
 * 3) Evaluating the sum of the sums of geometric progression
 * 4) Decomposing a standard normal CDF
 * 5) N throws of an unbalanced coin
 * 6) Topology
 * 7) Horizontal acceleration

= September 29 = Reference_desk/Archives/Mathematics/2010 September 29


 * 1) Proving converse of the Euclid's Lemma
 * 2) Linear Algebra
 * 3) z=cos2x+isin2x
 * 4) Implicit differentiation and polynomial division revisited

= September 30 = Reference_desk/Archives/Mathematics/2010 September 30


 * 1) Poisson Process
 * 2) Use de Moivre's theorem and the Pythagorean identity?
 * 3) Projectile motion problem
 * 4) Finding function definition from description
 * 5) {0,1} support RV