Wikipedia:Reference desk/Archives/Mathematics/February 2011

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February 1

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 1

1. Can somone help with the following proof
2. Matching Socks in the Dark
3. Area of a quadrilateral

February 2

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 2

1. Twelvefold way
2. Quick request for proof
3. Line segment
4. Stats and probability
5. Sectitive and Quantative Numbers

February 3

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 3

1. IPv4 vs IPv6 for dumdums?
2. supremum and infimum of a quotient of two series
3. Affine Grassmanian
4. Journal article author affiliation
5. Contour integral

February 4

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 4

1. matrix/vector algebra problem
2. Love heart
3. Finding range of 7+5cos5x divided by 8-6cos6x
4. Coin nominal values

February 5

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 5

1. maximization
2. gradient of scalar product
3. Multiplicative inverse function?
4. A calculus problem
5. Primitive Roots
6. proper class in ZFC
7. Algorithmic complexity
8. Seemingly simple problem

February 6

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 6

1. Un-deducting percentages
2. Integers
3. mathematics
4. Calculus
5. Input-to-state stability
6. Compact manifold without boundary not contractible

February 7

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 7

1. Human Population - Two Questions

February 8

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 8

1. Difficulty in finding Indefinite integral
2. Can game theory help with reverse auctions?

February 9

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 9

1. how long to cross the 0 on a random walk
2. mathematicians: useful or useless?
3. 3,5,7 = triple adjacent primes, are there any others?
4. Percent of negligible error
5. Fisher's Least Significant Difference test vs. Tukey's Least Significant Difference test (statistics)
6. Does such a value exist?
7. Good ol algebra word problems
8. discrete fourier transform in mathematica

February 10

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 10

1. Need help with puzzle. No solution please
2. Please calculate the total taxi fare and other fees from Itoman, Okinawa all the way to Cape Soya, Hokkaido.
3. H2: equidistant curve tangent to a given line
4. differentiation by first principles
5. Basic Probability
6. Compactly generated space
7. Probability question
8. Arc length integral

February 11

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 11

1. "One to one" and "onto"
2. Solving limits
3. Ballistics
4. Algorithm for Time Complexity?

February 12

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 12

1. Every possible combination of the numbers 1-8 assuming. . .

February 13

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 13

1. First d Decimal Places
2. Efficient linear algebra in a world of partial knowledge
3. Finitely presented groups isomorphic
4. Great circle direction

February 14

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 14

1. Heuristic justification for Goldbach's conjecture
2. Separation of variables problem

February 15

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 15

1. Unusual description of the Klein bottle
2. A derivatives question

February 16

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 16

1. Modeling High Dimensional Dynamical System
2. Generalisations of the Monty Hall problem
3. Non linear second order ODEs
4. Simultaneous functions
5. Dividing a Fraction by a whole number
6. Infinite groups

February 17

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 17

1. Need info on Octagonal Pyramid

February 18

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 18

1. arithmetic vs higher cardinality
2. Calculation of Pi
3. FDR and q-value

February 19

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 19

1. is the BFGS formula right?
2. Weierstrass substitution

February 20

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 20

1. "Reducible" differential equation
2. Geometric representation of square numbers
3. complex vs chaotic
4. Is it optimal for the evaluation method used to change with frequency?
5. Loxodromic transformation: product of 4 inversions

February 21

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 21

1. Adjusting for leap years

February 22

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 22

1. integrating
2. Functional square roots
3. Generators of functions

February 23

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 23

1. Math puzzle

February 24

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 24

1. Partial differentiation quiz

February 25

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 25

1. Limit monstrosity
2. Vertices of a hyperbolic tiling
3. Pumpkin weight problem
4. Asymptotes
5. problem with the algorithm for programing b-spline
6. Spiral staircase

February 26

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 26

1. Lagrangian Multipliers

February 27

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 27

1. Combinatorics/probability question
2. Bridge card hand: binary encoding problem
3. Interesting Integrals

February 28

Wikipedia:Reference_desk/Archives/Mathematics/2011 February 28

1. Formal proof of equivalences
2. Integration by Parts
3. Series question
4. Number of solutions in a system of linear equations
5. Taylor series question