Wikipedia:Reference desk/Archives/Mathematics/September 2010

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September 1

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 3

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

September 4

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 5

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

September 6

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 8

1. Σ and ʃ

September 9

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 12

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

September 13

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 13

1. exponents
2. Inverse function
3. Math

September 14

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 16

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

September 17

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 20

1. Your article

September 21

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 21

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

September 22

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 23

1. Mystery trig identity

September 24

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 25

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

September 26

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 26

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

September 27

Wikipedia:Reference_desk/Archives/Mathematics/2010 September 27

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

September 28

Wikipedia: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

Wikipedia: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

Wikipedia: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