Wikipedia:Reference desk/Archives/Mathematics/April 2010

= April 1 = Reference_desk/Archives/Mathematics/2010 April 1


 * 1) Roots of a quartic
 * 2) Sum of squared deviations (SSQ)
 * 3) Covariance and independence
 * 4) factorial
 * 5) Big integral symbol in Latex
 * 6) Givens Rotations and QR Factorisation

= April 2 = Reference_desk/Archives/Mathematics/2010 April 2


 * 1) Taylor expansion?
 * 2) de Bruijn's function
 * 3) Four-Variable Algebra Problem
 * 4) Complex Root of Unity
 * 5) Properties of Triangles given Coordinates of vertices?
 * 6) A question for any "soccer" enthusiasts out there.

= April 3 = Reference_desk/Archives/Mathematics/2010 April 3


 * 1) General variable
 * 2) Induction Question
 * 3) Proving points on same line...

= April 4 = Reference_desk/Archives/Mathematics/2010 April 4


 * 1) When will things in the U.S. seem to have been improving the most? (on Humanities)
 * 2) Product of two differentials
 * 3) One-way repeated measures ANOVA or something better?
 * 4) Countable closed partition of R
 * 5) Invalid Triangle?
 * 6) Interesting Calculus Examples (integrals)

= April 5 = Reference_desk/Archives/Mathematics/2010 April 5


 * 1) Determining x in exponentials

= April 6 = Reference_desk/Archives/Mathematics/2010 April 6


 * 1) 3d surface

= April 7 = Reference_desk/Archives/Mathematics/2010 April 7


 * 1) Linear Combinations
 * 2) Video Lectures on Topology and/or Differential Geometry

= April 8 = Reference_desk/Archives/Mathematics/2010 April 8


 * 1) Biased dice
 * 2) Vacuous truth

= April 9 = Reference_desk/Archives/Mathematics/2010 April 9


 * 1) Question about vacuous truth
 * 2) integer solutions
 * 3) LaTeX enumerate
 * 4) Eigenvector definition
 * 5) Symbol origins

= April 11 = Reference_desk/Archives/Mathematics/2010 April 11


 * 1) Expressing an integer as a sum of powers of a prime
 * 2) how do you distribute poison?

= April 12 = Reference_desk/Archives/Mathematics/2010 April 12


 * 1) Simple way to weight average ratings by total ratings?
 * 2) Equations on cartesian planes with interesting properties
 * 3) Set theory
 * 4) Subconical shapes?
 * 5) Lowering Summed Indices for Tensors
 * 6) Probability
 * 7) Taylor-like Series
 * 8) Adomian decomposition method

= April 13 = Reference_desk/Archives/Mathematics/2010 April 13


 * 1) Three Dimension
 * 2) Complex logarithm
 * 3) Reuptake of a question 2d travel distance and energy expenditure vs. 3d - ramblings
 * 4) fractals and harmonics
 * 5) equations that scale and fractals

= April 14 = Reference_desk/Archives/Mathematics/2010 April 14


 * 1) Randomness Testing
 * 2) Diophantine equation
 * 3) RSA
 * 4) Sum

= April 15 = Reference_desk/Archives/Mathematics/2010 April 15


 * 1) roots of an equation
 * 2) Notation
 * 3) nature makes its move
 * 4) The Earth Ellipsoid
 * 5) Price elasticity, quantity demanded

= April 16 = Reference_desk/Archives/Mathematics/2010 April 16


 * 1) Internet searches for non-linear notations
 * 2) Why don't AND and OR form a ring?
 * 3) Markov Chains
 * 4) what's the most useful theorem a computer programmer should know exists/is true?
 * 5) Number generation based on past data
 * 6) Probability perception

= April 18 = Reference_desk/Archives/Mathematics/2010 April 18


 * 1) long-term probability of heads on a biased coin
 * 2) N factors
 * 3) Soduku proof
 * 4) Demographic thought experiment

= April 19 = Reference_desk/Archives/Mathematics/2010 April 19


 * 1) Proof of Exponential Growth Formula
 * 2) Expected Values for Chi-Square Table
 * 3) real numbers
 * 4) Curl

= April 20 = Reference_desk/Archives/Mathematics/2010 April 20


 * 1) Distribution of size of largest prime factor
 * 2) Math contests

= April 21 = Reference_desk/Archives/Mathematics/2010 April 21


 * 1) Teabags
 * 2) Wronskian and Linear Independance
 * 3) What came first? (trig + calc. related stuff)

= April 23 = Reference_desk/Archives/Mathematics/2010 April 23


 * 1) Rejection Method for simulating random values from a density function and Conditioning Approach for reducing the variance in a parameter estimate
 * 2) Cofree object
 * 3) prime numbers
 * 4) Constructing prime ideals

= April 24 = Reference_desk/Archives/Mathematics/2010 April 24


 * 1) Linear / ... / logarithmic scale
 * 2) Schrodinger Eigenvalues

= April 25 = Reference_desk/Archives/Mathematics/2010 April 25


 * 1) Square of wavefunction
 * 2) Polynomials
 * 3) Reverse of an n-gram model
 * 4) Quantum Harmonic Oscillator
 * 5) Two sample t-test in R

= April 26 = Reference_desk/Archives/Mathematics/2010 April 26


 * 1) A number that is itself
 * 2) apparent misprint:S
 * 3) Factorisation
 * 4) Period (number)
 * 5) Generation of batting sequences
 * 6) Work Word problem
 * 7) Uncountably Large Subfields of the Real Numbers?
 * 8) Complicated Integration based on a Cylinder Cross-section
 * 9) Redefining The Comparison of Cardinal Numbers

= April 27 = Reference_desk/Archives/Mathematics/2010 April 27


 * 1) Squaring the wavefunction #2
 * 2) integer solutions
 * 3) Degree by which data is partitioned
 * 4) Non-associativity of substitution in calculus

= April 28 = Reference_desk/Archives/Mathematics/2010 April 28


 * 1) Grade of Shade Cloth
 * 2) Cross ratio
 * 3) Math Shortcuts

= April 29 = Reference_desk/Archives/Mathematics/2010 April 29


 * 1) area of the sphere above a plane
 * 2) Second limit comparisson test?
 * 3) 1/49
 * 4) Drawing a Penis on a Ti-84
 * 5) Changing the scale in a log log function
 * 6) Understanding Sphere Volume/Area Formulas
 * 7) Integrating for volume

= April 30 = Reference_desk/Archives/Mathematics/2010 April 30


 * 1) Need a tutorial on calculating moments
 * 2) Division Puzzle
 * 3) Quick query about eigenvalues of a positive real matrix
 * 4) Even distribution on a sphere
 * 5) Sqrt
 * 6) Product rule on Banach spaces