Wikipedia:Reference desk/Archives/Mathematics/May 2010

= May 1 = Reference_desk/Archives/Mathematics/2010 May 1


 * 1) Gene DNA GC content against whole genome DNA GC content.
 * 2) Help in Solving Tensor Equation
 * 3) Operator norm and isomorphisms
 * 4) games that do not end
 * 5) Asians, Indians, and Eastern Europeans
 * 6) Derivatives
 * 7) long differential equations problem
 * 8) Romanian army / vehicle volume

= May 2 = Reference_desk/Archives/Mathematics/2010 May 2


 * 1) Information theory terminology
 * 2) Winning games
 * 3) Shared Zeros of Quadratic forms
 * 4) Ideals in a PID

= May 3 = Reference_desk/Archives/Mathematics/2010 May 3


 * 1) show that cos(2pi/7)+cos(4pi/7)+cos(6pi/7)=-1/2
 * 2) Formal proof that (2^x-1)/(3x!+x^2-1) converges to 0
 * 3) Paying a point for lower mortgage rate
 * 4) Uniform distribution
 * 5) Ramsey Theory and TCS
 * 6) line and curve fitting algorithms

= May 4 = Reference_desk/Archives/Mathematics/2010 May 4


 * 1) Completing rows/columns in a character table
 * 2) Retrieving the Metric from Christoffel Symbols
 * 3) Number of conjugacy classes
 * 4) Constructible Universe
 * 5) request algorithm for vertex-weighted bipartite graph problem
 * 6) Modular forms/eta function

= May 5 = Reference_desk/Archives/Mathematics/2010 May 5


 * 1) line integrals with respect to arc length versus x or y
 * 2) 1D projection

= May 6 = Reference_desk/Archives/Mathematics/2010 May 6


 * 1) Maclaurin expansion for e^(x^2+x)
 * 2) don't get why I don't get my moment for this disc doesn't become zero
 * 3) Random walk oddity
 * 4) Problem with product rule and second derivatives
 * 5) Algebra question

= May 7 = Reference_desk/Archives/Mathematics/2010 May 7


 * 1) Urgent question to someone with a copy of SPSS in front of him/her
 * 2) Discrete maths
 * 3) Flows with equal time 1 maps
 * 4) The statistical r and P, in scientific reports. What do they and their various values tell?
 * 5) Close flows => close vector fields?
 * 6) Finding joint distribution from two marginal distributions

= May 8 = Reference_desk/Archives/Mathematics/2010 May 8


 * 1) sin(sin t)?
 * 2) The armed force of Ghana ...

= May 9 = Reference_desk/Archives/Mathematics/2010 May 9


 * 1) Best statistical method to compare sensitivity in 2 binary tests?
 * 2) Markov chain on an n-cycle

= May 10 = Reference_desk/Archives/Mathematics/2010 May 10


 * 1) Group Theory
 * 2) Proving that 0 is the only bounded 1-periodic planar vector field

= May 11 = Reference_desk/Archives/Mathematics/2010 May 11


 * 1) How to derive asymptotic expansion of error function?
 * 2) Closed level curves
 * 3) 4 digit number
 * 4) Calculating distance to a cloud on the horizon
 * 5) Calculating distance to a cloud not on the horizon
 * 6) Curvature not intrinsic for curves???
 * 7) Does this result have a name?
 * 8) Terminology
 * 9) Triple functions
 * 10) Euler's constant

= May 12 = Reference desk/Archives/Mathematics/2010 May 12


 * 1) Graphic calculator.
 * 2) Prove that the tangent to the x value which is the average of two zeros of a cubic passed through the third zero.`
 * 3) What mathematical operation to you perform on a number to reverse its digits?
 * 4) Functions help
 * 5) Poisson distribution, but where events are not independent of the time of the last event
 * 6) y=xx
 * 7) Integration help
 * 8) Tangent to a cubic

= May 13 = Reference desk/Archives/Mathematics/2010 May 13


 * 1) A slight variation on maps from the disc to the UHP model
 * 2) Is there a name for this special complex function?
 * 3) calculation help

= May 14 = Reference desk/Archives/Mathematics/2010 May 14


 * 1) Perimeter estimation

= May 15 = Reference desk/Archives/Mathematics/2010 May 15


 * 1) 2cosx+2cos(2x)=0

= May 17 = Reference desk/Archives/Mathematics/2010 May 17


 * 1) ridiculous indefinite integral question
 * 2) Geometry problem
 * 3) SAS instruction books

= May 18 = Reference desk/Archives/Mathematics/2010 May 18


 * 1) Differential solid angle
 * 2) wheels of constant width and variations
 * 3) Fit an exponential curve

= May 19 = Reference desk/Archives/Mathematics/2010 May 19


 * 1) Eigenvectors
 * 2) Dart question
 * 3) Constant continuous maps between a topology on the natural numbers and the reals

= May 20 = Reference desk/Archives/Mathematics/2010 May 20


 * 1) Maclaurin series
 * 2) Partial Surface Area of a Sphere
 * 3) Applications of calculus in lower maths
 * 4) Definition of the (units of time)...that make up the components of one second.

= May 21 = Reference_desk/Archives/Mathematics/2010 May 21


 * 1) Linear recurrence
 * 2) behaviour of rotating hardboiled egg
 * 3) sum continous random variable
 * 4) Finding a geodesic
 * 5) Newton's division

= May 22 = Reference_desk/Archives/Mathematics/2010 May 22


 * 1) derivative of sin(ax)
 * 2) Stable ranges for Albedo and Emissivity of Earth
 * 3) If diameter divided  Circumference, what we will get?
 * 4) Quick query on index 5 subgroups of A5
 * 5) Euler's constant again

= May 23 = Reference_desk/Archives/Mathematics/2010 May 23


 * 1) Help for an estimate
 * 2) Isometries of the Poincare Disc

= May 24 = Reference_desk/Archives/Mathematics/2010 May 24


 * 1) Type II error question
 * 2) Probability in a deck of cards
 * 3) What is it called....
 * 4) Need a simple function
 * 5) Line inttegral

= May 25 = Reference_desk/Archives/Mathematics/2010 May 25


 * 1) Sophocles' Antigone
 * 2) algebra manipulation
 * 3) A derivative of sorts?
 * 4) Perimeter estimation
 * 5) Equivalency

= May 26 = Reference_desk/Archives/Mathematics/2010 May 26


 * 1) Wall Street and proof theory -- wtf?
 * 2) differential equation
 * 3) Extension of implications of Normal Topological Spaces
 * 4) 'Reflection invariant' Set
 * 5) Standard Deviation in Normal Approximation of Binomial Distribution
 * 6) Graph of a function
 * 7) Ellipse

= May 27 = Reference_desk/Archives/Mathematics/2010 May 27


 * 1) Calculating df for unpooled t-test
 * 2) Gregory-Madhava Series
 * 3) Newton's F*dt=m*dv  integral!

= May 28 = Reference_desk/Archives/Mathematics/2010 May 28


 * 1) What were her speeds please

= May 29 = Reference_desk/Archives/Mathematics/2010 May 29


 * 1) Is Axiom of Extensionality Converse true (special formulation)?
 * 2) Maple 13
 * 3) What does F(x|theta) mean?
 * 4) why cant we integrate (sinx)^2 and (cosx)^2 without using cos2x
 * 5) Making 2+2=5
 * 6) Question about 3SAT and NP-Complete

= May 30 = Reference_desk/Archives/Mathematics/2010 May 30


 * 1) Complex analysis questions
 * 2) Algebraic expressions for the standard trigonometric functions
 * 3) Exam question thats stumping me...
 * 4) Prove
 * 5) Matrices to the power n in an n-dimensional complex vector space

= May 31 = Reference_desk/Archives/Mathematics/2010 May 31


 * 1) Notational Inconsistencies in Vectors
 * 2) Percentage increase
 * 3) Please help with a couple questions I've been stuck on for weeks! Curvature, projective modules & metric spaces