Wikipedia:Reference desk/Archives/Mathematics/March 2010

= March 1 = Reference_desk/Archives/Mathematics/2010 March 1


 * 1) Critical point of a constant function
 * 2) Sums & products of random numbers.
 * 3) Integers into a Line with an Overlap
 * 4) The spinor map

= March 2 = Reference_desk/Archives/Mathematics/2010 March 2


 * 1) Hyperbolic Line Reflection, and Isometry between H/D
 * 2) HOW TO DRAW
 * 3) Riddle, where is the mistake in ALL x = 0 ?
 * 4) Logistic Function
 * 5) Strange proof

= March 3 = Reference_desk/Archives/Mathematics/2010 March 3


 * 1) Taylor polynomials and errors (homework)
 * 2) Maximum angle
 * 3) Topology: Is there a name for a function differentiable in its connected open domain?
 * 4) Ring Z[sqrt(2)]: complete set of units
 * 5) Casual language usage, or is there an example?

= March 4 = Reference_desk/Archives/Mathematics/2010 March 4


 * 1) Simplifying an expression involving radicals
 * 2) Vectors
 * 3) Small lie brackets and commutators
 * 4) Random walk

= March 5 = Reference_desk/Archives/Mathematics/2010 March 5


 * 1) semiprime number theorem
 * 2) Prime numbers
 * 3) Toilet paper calculus
 * 4) Mobius Strip
 * 5) A Simple Linear Functional Equation
 * 6) 400 million French Francs in 1940

= March 6 = Reference_desk/Archives/Mathematics/2010 March 6


 * 1) is number theory worth studying if one doesn't plan to make a contribution?
 * 2) Quotient constructions
 * 3) Inner Product Spaces
 * 4) 120 deg?
 * 5) sin-1
 * 6) Expected minimum from non-parametrized distribution
 * 7) How to determine the angle a line drawn between two concentric arcs  makes with the tangent of the outer arc..
 * 8) statistics-- median in following case

= March 7 = Reference_desk/Archives/Mathematics/2010 March 7


 * 1) How to do a Recurrence plot
 * 2) Simplifying Trig Identities
 * 3) Undefinability by any "almost-pure identity" formula (of first-order):
 * 4) How many different types of phase-space plot are there?
 * 5) Graph of a smooth function is a smooth embedded surface?
 * 6) The probability of a normally distributed random variable being a particular value

= March 8 = Reference_desk/Archives/Mathematics/2010 March 8


 * 1) Catching cheaters in a math class
 * 2) Easy free software for drawing (phase space) graphs from statistical time-series data?
 * 3) Calculating eigenvector for beginners

= March 9 = Reference_desk/Archives/Mathematics/2010 March 9


 * 1) Homework question
 * 2) Divisibility In Digit-by-Digit Inter-Base Conversion

= March 10 = Reference_desk/Archives/Mathematics/2010 March 10


 * 1) How do you prove that $x$ generates the multiplicative group of $GF(p)[x]/f(x)$ if $f(x)$ is a primitive polynomial?
 * 2) Project Euler problem
 * 3) Is C∞ dense between the measure preserving transformations?
 * 4) 'Extension' of a linear transformation?
 * 5) Complex Analytic Functions

= March 11 = Reference_desk/Archives/Mathematics/2010 March 11


 * 1) Quick question on integration by parts and non-integer values of the Gamma function
 * 2) Length of a function
 * 3) Why doesn't Cantor's diagonal argument apply to rationals?
 * 4) What is the 98th percentile in a Normal distribution with μ=100 and σ=15?

= March 12 = Reference_desk/Archives/Mathematics/2010 March 12


 * 1) little project
 * 2) How many types of numbers are there?
 * 3) Absolute value of a quaternion
 * 4) Domain of a function
 * 5) Statistical significance when discussing a population
 * 6) feedback rating

= March 13 = Reference_desk/Archives/Mathematics/2010 March 13


 * 1) Maclaurin expansion
 * 2) Statistics - Conditioning
 * 3) Stats -- algebraic manipulation of V(X) and E(X), etc.
 * 4) Symmetric linear solve
 * 5) simple question.
 * 6) is there any proof that current compression couldn't be much better?
 * 7) L'Hopital's rule
 * 8) Approximations to roots

= March 14 = Reference_desk/Archives/Mathematics/2010 March 14


 * 1) Approximate solutions to equation
 * 2) Geometry problem
 * 3) Terminology: equivalence of ordering or optima
 * 4) Sparse Graph Colorings
 * 5) Integration
 * 6) L'Hopital vs. Landau

= March 15 = Reference_desk/Archives/Mathematics/2010 March 15


 * 1) Normal distributed random variable mathematics
 * 2) Representation of Haar scaling function in terms of Haar wavelet
 * 3) Cases where Euclid's first common notion doesn't apply
 * 4) crisis in geometry

= March 16 = Reference_desk/Archives/Mathematics/2010 March 16


 * 1) Sum of i?
 * 2) four dimensional space.
 * 3) Was 2 always prime?
 * 4) Request for input at our Entertainment desk
 * 5) Inner Product Spaces
 * 6) X/Y

= March 17 = Reference_desk/Archives/Mathematics/2010 March 17


 * 1) Plank Time
 * 2) Local connection between measure preserving transformations
 * 3) Character question
 * 4) Lambert W function for a base other than e

= March 18 = Reference_desk/Archives/Mathematics/2010 March 18


 * 1) Integrating differential terms independently of each other in a single equaiton
 * 2) formulas which induce functions
 * 3) Expected value of a difference
 * 4) Distance along a parabola
 * 5) Drive time commute
 * 6) Rank-Nullity

= March 19 = Reference_desk/Archives/Mathematics/2010 March 19


 * 1) Fractions
 * 2) "Half" of the real numbers
 * 3) sum of fractional differences
 * 4) Alternative notations for exponentiation
 * 5) Automorphisms of the Riemann sphere
 * 6) q test not for idiots ...  (a q test table for a 99.9999% confidence level?)
 * 7) rack

= March 20 = Reference_desk/Archives/Mathematics/2010 March 20


 * 1) Integration by substitution
 * 2) Interest computation- when compounding frequency is lesser than pay out frequency
 * 3) Could someone learn all the notation from all the branches of mathematics in a year?
 * 4) Restriction

= March 21 = Reference_desk/Archives/Mathematics/2010 March 21


 * 1) Finding the nth term of a sequence given a bunch of terms (statistics question)
 * 2) Arc length extension
 * 3) Probability question
 * 4) how to copy the equations  and all mathaematical terms from wikipedia to MS Word?
 * 5) Formula to undistort the image from a shiny sphere

= March 22 = Reference_desk/Archives/Mathematics/2010 March 22


 * 1) Statistics question: Estimating a probability distribution given sample trials
 * 2) Iterations of a multiplicative function
 * 3) Inverse functions $e^x - e^{-x}$ and $ln left ( frac{ x + sqrt{ x + 4 } }{2} right ) $
 * 4) If and only if symbol to use in thesis
 * 5) Optimal location of a bridge

= March 23 = Reference_desk/Archives/Mathematics/2010 March 23


 * 1) How to parametrise distribution given a few CDF points
 * 2) nth iteration of a koch snowflake
 * 3) what's the best area for contributing something practical
 * 4) Distribution of a subset of a distribution
 * 5) how much do words impede mathematics
 * 6) Questions about Birkhoff Normal form

= March 24 = Reference_desk/Archives/Mathematics/2010 March 24


 * 1) How to display surds on the TI-84 Plus
 * 2) the volume of a solid bounded by the lines x=0, y=0, z=0 and the plane x+y+z=9
 * 3) Poincare Conjecture and Ricci flow
 * 4) Beads on a necklace

= March 25 = Reference_desk/Archives/Mathematics/2010 March 25


 * 1) Circle
 * 2) A matrix M raised to the i-th power (i being imaginary), or the natural base raised to the M-th power (M being a matrix).
 * 3) Dissections in Riemann Integration
 * 4) Two dimensional representation of an arbitrary distance matrix
 * 5) Normed field
 * 6) Periodic formula of an EKG shape?
 * 7) Reverse engineering a graph
 * 8) Number of non-isomorphic graphs in n vertices?

= March 26 = Reference_desk/Archives/Mathematics/2010 March 26


 * 1) unsolved problems
 * 2) Navier-Stokes equation
 * 3) Wiener process properties
 * 4) Opposite Category of Sets
 * 5) Finite differences in exponential powers
 * 6) I need your knowledge in all mathematical realms you are familiar with.
 * 7) Curve Sketching

= March 27 = Reference_desk/Archives/Mathematics/2010 March 27


 * 1) Lattice of quotient groups
 * 2) maruschka doll and half-life - fractals?

= March 28 = Reference_desk/Archives/Mathematics/2010 March 28


 * 1) How much should my game cost?
 * 2) Tricky trig integral
 * 3) How to tell if a time series is nonlinear or not?
 * 4) Probability

= March 29 = Reference_desk/Archives/Mathematics/2010 March 29


 * 1) Rouché's theorem and real solutions
 * 2) Birthday Probabilities

= March 30 = Reference_desk/Archives/Mathematics/2010 March 30


 * 1) Guests at a dinner party
 * 2) Taking log of pie sign gives summation sign
 * 3) Simple/Compound Interest Comparison

= March 31 = Reference_desk/Archives/Mathematics/2010 March 31


 * 1) Variance