Wikipedia:Reference desk/Archives/Mathematics/January 2009

= January 1 = Reference_desk/Archives/Mathematics/2009 January 1


 * 1) Simple permutations/combinations?

= January 2 = Reference_desk/Archives/Mathematics/2009 January 2


 * 1) Modular arithmetic into which the primes fit neatly

= January 3 = Reference_desk/Archives/Mathematics/2009 January 3


 * 1) Fractal line
 * 2) What is the expected value of the lowest of four numbers?
 * 3) lease money factor

= January 4 = Reference_desk/Archives/Mathematics/2009 January 4


 * 1) Sir Isaac Newton

= January 5 = Reference_desk/Archives/Mathematics/2009 January 5


 * 1) Discussion for On-Line Algebra

= January 6 = Reference_desk/Archives/Mathematics/2009 January 6


 * 1) Product (not normal) symbol in LaTeX
 * 2) does 0.999... equal 1 ?
 * 3) max size of disconnected graph
 * 4) roots of y=0 and definitions
 * 5) Determining size of label for cylindrical bottle

= January 7 = Reference_desk/Archives/Mathematics/2009 January 7


 * 1) Estimation problem

= January 8 = Reference_desk/Archives/Mathematics/2009 January 8


 * 1) Group Axioms
 * 2) Original research and WP:OR
 * 3) Seeking a definition of "Positive Terms"
 * 4) Question relating to the discriminant

= January 9 = Reference_desk/Archives/Mathematics/2009 January 9


 * 1) a question regarding liters and milliliters
 * 2) Is this equation solveable without a computer/brute force?
 * 3) Algebra II word problem

= January 10 = Reference_desk/Archives/Mathematics/2009 January 10


 * 1) Does this continued fraction converge?
 * 2) Pentagons
 * 3) max size of a k-component graph
 * 4) Multiplying integers by digit-swapping.
 * 5) 3x3 Antisymmetric Matrices
 * 6) Three '2's Problem

= January 11 = Reference_desk/Archives/Mathematics/2009 January 11


 * 1) Group of points on the unit sphere
 * 2) Unidentified trig functions/identities?
 * 3) Conic section slope of directrix
 * 4) Cubic functions
 * 5) Manifolds

= January 12 = Reference_desk/Archives/Mathematics/2009 January 12


 * 1) A Pascal's triangle question I've never seen before
 * 2) Leibniz notation
 * 3) Lebesgue Integrals
 * 4) Reference_desk/Archives/Mathematics/2009 January 12
 * 5) combination and permutation
 * 6) Law of excluded middle

= January 13 = Reference_desk/Archives/Mathematics/2009 January 13


 * 1) the complex plane
 * 2) is a straight line a right angle triangle?
 * 3) Lefschetz numbers
 * 4) Interest calculation (discontinuous)
 * 5) Convolution

= January 14 = Reference_desk/Archives/Mathematics/2009 January 14


 * 1) Sphere specialists?
 * 2) Modeling using overlapping probability distributions
 * 3) definition for geometry situation

= January 15 = Reference_desk/Archives/Mathematics/2009 January 15


 * 1) Trivial questions and removal of posts
 * 2) Interesting geometric and probability question

= January 16 = Reference_desk/Archives/Mathematics/2009 January 16


 * 1) Probability and the universe
 * 2) If a coefficient is significantly different from 1.00
 * 3) Arclength
 * 4) Matrix
 * 5) Basic math elements
 * 6) Measureable sets
 * 7) check

= January 17 = Reference_desk/Archives/Mathematics/2009 January 17


 * 1) Exam on Wednesday! Help me!
 * 2) category has fibre products => has equalisers?
 * 3) Spider pursuing a fly on the net of a polyhedron
 * 4) Balls

= January 18 = Reference_desk/Archives/Mathematics/2009 January 18


 * 1) 3 spiders and a fly
 * 2) volume of a nonEuclidean tetrahedron
 * 3) Infinity multiplied by zero
 * 4) the square root of $i$
 * 5) Henge circles
 * 6) Continued fractions and quadratic irrationals
 * 7) One cannot reconstruct a finite group from its character table

= January 19 = Reference_desk/Archives/Mathematics/2009 January 19


 * 1) math coincidence
 * 2) Level in a horizontal cylinder
 * 3) Meaning of 'deviated from their sample means'
 * 4) A question about consistent mass matrices in Finite Element Analysis

= January 20 = Reference_desk/Archives/Mathematics/2009 January 20


 * 1) Geometry problem
 * 2) Ordinary Annuity
 * 3) Positive roots of subsystems

= January 21 = Reference_desk/Archives/Mathematics/2009 January 21


 * 1) solving for radius?
 * 2) Diophantine
 * 3) Reference_desk/Archives/Mathematics/2009 January 21
 * 4) What do you call a + or - sign (to indicate positive or negative numbers)?
 * 5) Math, via Civil Engineering
 * 6) Transcentdental numbers

= January 22 = Reference_desk/Archives/Mathematics/2009 January 22


 * 1) about infinity
 * 2) Physics: power of water pump
 * 3) Commuting elements in SO(3)
 * 4) Physics: Work from force on inclined plane
 * 5) Compound compound Poisson Distribution
 * 6) Generalised Gauss-Bonnet theorem

= January 23 = Reference_desk/Archives/Mathematics/2009 January 23


 * 1) logical numerical order to follow
 * 2) circles

= January 24 = Reference_desk/Archives/Mathematics/2009 January 24


 * 1) would you give credit?
 * 2) why is mathematics a requirement
 * 3) Alternative inequality symbols and logic

= January 25 = Reference_desk/Archives/Mathematics/2009 January 25


 * 1) Riemann Surface for Dummies
 * 2) simple quadrilateral from distance matrix
 * 3) Unity
 * 4) Question about probability and ergodicity

= January 26 = Reference_desk/Archives/Mathematics/2009 January 26


 * 1) Turkish numerals
 * 2) zero divisors in non-commutative rings
 * 3) electric   watts to amps
 * 4) What is $frac{0}{0}$?
 * 5) Reference_desk/Archives/Mathematics/2009 January 26
 * 6) Variable Changing in Multiple Integrals
 * 7) Definition for │x│
 * 8) Many-body problems
 * 9) Roman numerals on watch dials
 * 10) Lim sup of number of divisors
 * 11) Notation

= January 27 = Reference_desk/Archives/Mathematics/2009 January 27


 * 1) Rotating a Right Traingle 180 Degrees
 * 2) Weierstrass-Enneper parametrization
 * 3) College Math Help!
 * 4) why not fermats last conjecture
 * 5) Wake Angle
 * 6) Co-ordinate geometry
 * 7) saving time
 * 8) Evaluate trigonometric definite integral

= January 28 = Reference_desk/Archives/Mathematics/2009 January 28


 * 1) Notation used in Wikipedia article "Prime Gap"

= January 29 = Reference_desk/Archives/Mathematics/2009 January 29


 * 1) Proven but not constructed
 * 2) Some Number Theory
 * 3) Sum of interior angles of polygons constant - proof?
 * 4) Numerical error
 * 5) sin(G)

= January 30 = Reference_desk/Archives/Mathematics/2009 January 30


 * 1) Calc 1 Question
 * 2) Common name for spheres and circles.
 * 3) Rotation along a certain point...
 * 4) Curiosity has revived the calculus - A math homework from yesteryear

= January 31 = Reference_desk/Archives/Mathematics/2009 January 31


 * 1) formula to calculate pi
 * 2) Euler's proof that god exists
 * 3) Localization Morphism
 * 4) elementary graph theory
 * 5) Modular arithmetic/number theory
 * 6) Vectors & Potentials