Wikipedia:Reference desk/Archives/Mathematics/June 2010

= June 1 = Reference_desk/Archives/Mathematics/2010 June 1


 * 1) Find extremum
 * 2) Crop circles of pi and Euler's identity
 * 3) Maximum/Minimum Irradiance for "Human habitable" planet temperatures?

= June 2 = Reference_desk/Archives/Mathematics/2010 June 2


 * 1) weakly normalised
 * 2) closed immersion of smooth varieties

= June 3 = Reference_desk/Archives/Mathematics/2010 June 3


 * 1) Tangent/secant functions
 * 2) What is the name?
 * 3) Integrating

= June 4 = Reference_desk/Archives/Mathematics/2010 June 4


 * 1) Finding angle between vectors in two dimensions
 * 2) Co-NP
 * 3) Drawing a quadrilateral?
 * 4) Quadrilateral 2d shape

= June 5 = Reference_desk/Archives/Mathematics/2010 June 5


 * 1) General statistics question
 * 2) Symmetry in a multi-dimensional space

= June 6 = Reference_desk/Archives/Mathematics/2010 June 6


 * 1) Operator, or transform, as a mapping between classes of functions
 * 2) Niggle: given a mapping between two classes of members
 * 3) Always possible to find a matrix that transform a matrix into reduced row echelon form?
 * 4) Bijection wanted with S_n
 * 5) Is the following article removed?

= June 8 = Reference_desk/Archives/Mathematics/2010 June 8


 * 1) Ratios
 * 2) What happens at x=Pi/2
 * 3) Homomorphism
 * 4) Newline formatting in Wikipedia LaTeX
 * 5) Measures of complexity (Chemistry)
 * 6) Meaning of eigenvalue, eigenvector

= June 9 = Reference_desk/Archives/Mathematics/2010 June 9


 * 1) Stddev and stdevpop on TI-89 Titanium
 * 2) QBF(PSPACE Complete Problem)
 * 3) Meaning of a Conjecture Being Undecidable
 * 4) Program to Find Primes
 * 5) trignometry
 * 6) anti-transpose?

= June 10 = Reference_desk/Archives/Mathematics/2010 June 10


 * 1) Dense open set in the reals with finite measure
 * 2) how to integrate this function?
 * 3) Subset Sum Input Size
 * 4) Combined distribution of Beta distributed variables
 * 5) Tent Poles

= June 11 = Reference_desk/Archives/Mathematics/2010 June 11


 * 1) Simple Type 1 error problem
 * 2) Proof that Euclid’s fifth postulate cannot be proven.
 * 3) 2.8651496649...

= June 13 = Reference_desk/Archives/Mathematics/2010 June 13


 * 1) Meromorphic invertible functions
 * 2) Limits / infinite series
 * 3) Taylor series

= June 14 = Reference_desk/Archives/Mathematics/2010 June 14


 * 1) Proof that infinity equals -1
 * 2) Program for creating mathematical graphs
 * 3) How do you write integration limits of the solution in TeX?

= June 15 = Reference_desk/Archives/Mathematics/2010 June 15


 * 1) Data analysis help
 * 2) Getting gradient of a contour
 * 3) Riddle (which I invented):

= June 16 = Reference_desk/Archives/Mathematics/2010 June 16


 * 1) Could someone please look at this supposed solution to Collatz conjecture
 * 2) Partitions of n
 * 3) Partitions of n with a conditions
 * 4) Wolfram Alpha

= June 17 = Reference_desk/Archives/Mathematics/2010 June 17


 * 1) Map pinpont problem
 * 2) Arithmetic sum question
 * 3) Given a family of sets, I can generate a partition of their union set, by looking at their overlapping...
 * 4) Moment-generating function of the Binomial distribution
 * 5) some controversial questions

= June 18 = Reference_desk/Archives/Mathematics/2010 June 18


 * 1) Order of polynomial / Gaussian Numerical Integration
 * 2) Hahn fields
 * 3) How do you call this number?
 * 4) Mathematicians by country

= June 19 = Reference_desk/Archives/Mathematics/2010 June 19


 * 1) Estimating a minimum from discrete points
 * 2) Continuity of the inverse function
 * 3) Equilateral planets
 * 4) Is the integral of 1/x = ln(x)+C or ln|x|+C ?

= June 20 = Reference_desk/Archives/Mathematics/2010 June 20


 * 1) Fields medal
 * 2) A-invariant subspaces
 * 3) Right-angled triangles in a quadrant

= June 21 = Reference_desk/Archives/Mathematics/2010 June 21


 * 1) Books on Randomness
 * 2) Grand Piano lid prop angles
 * 3) Which Statistics Test?

= June 22 = Reference_desk/Archives/Mathematics/2010 June 22


 * 1) Euclidean Geometry
 * 2) Kepler's First Law (Antiderivative)
 * 3) World Cup group stages  - how likely is it that drawing of lots would be required?

= June 23 = Reference_desk/Archives/Mathematics/2010 June 23


 * 1) hint needed for apparently difficult problem
 * 2) dy
 * 3) Solving equations like this

= June 24 = Reference_desk/Archives/Mathematics/2010 June 24


 * 1) Constrained solutions of a linear equation
 * 2) Simple formula
 * 3) Probability Distributions

= June 25 = Reference_desk/Archives/Mathematics/2010 June 25


 * 1) Probability question
 * 2) Linear or non-linear time series
 * 3) MUSIC INVERSION AS A MATHEMATICAL PATTERN

= June 26 = Reference_desk/Archives/Mathematics/2010 June 26


 * 1) Vector calculus
 * 2) Contingent events
 * 3) Limits
 * 4) power series

= June 27 = Reference_desk/Archives/Mathematics/2010 June 27


 * 1) Speed please
 * 2) Bayesian Inference?
 * 3) Domain/Range of this function
 * 4) The probability that a hypothesis is true before any evidence is presented
 * 5) Surface area of a slice of a sphere
 * 6) An estimate to the closed form expression of a function
 * 7) Is this a well-known search algorithm, and, if so, what is it called?

= June 28 = Reference_desk/Archives/Mathematics/2010 June 28


 * 1) Bayesian inference with very little information
 * 2) Exponents and Fractions
 * 3) Statistical sample
 * 4) General Cardioid Equation
 * 5) Limaçon
 * 6) Are these formulas known in the litterature of statistics?

= June 29 = Reference_desk/Archives/Mathematics/2010 June 29


 * 1) Vector similarity
 * 2) Invalid proofs
 * 3) Solving for the same exponential variable on both sides of an equation
 * 4) Fan Curve

= June 30 = Reference_desk/Archives/Mathematics/2010 June 30


 * 1) Admissible decision rule pdf
 * 2) Inverse scaling
 * 3) nth power...
 * 4) Given 700 possible participants, how many need be surveyed for a useful random sample?
 * 5) Weighted coins and prior
 * 6) Homogeneous Continuous-time Markov chains - analytical expressions for the finite time transition probabilities?