Wikipedia:Reference desk/Archives/Mathematics/April 2010

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April 1

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 3

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

April 4

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 5

1. Determining x in exponentials

April 6

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 6

1. 3d surface

April 7

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 7

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

April 8

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 8

1. Biased dice
2. Vacuous truth

April 9

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 14

1. Randomness Testing
2. Diophantine equation
3. RSA
4. Sum

April 15

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 20

1. Distribution of size of largest prime factor
2. Math contests

April 21

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 21

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

April 23

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 24

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

April 25

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 April 28

1. Grade of Shade Cloth
2. Cross ratio
3. Math Shortcuts

April 29

Wikipedia: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

Wikipedia: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