Wikipedia:Reference desk/Archives/Mathematics/May 2010

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May 1

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 May 5

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

May 6

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 May 8

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

May 9

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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=x^x
7. Integration help
8. Tangent to a cubic

May 13

Wikipedia: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

Wikipedia:Reference desk/Archives/Mathematics/2010 May 14

1. Perimeter estimation

May 15

Wikipedia:Reference desk/Archives/Mathematics/2010 May 15

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

May 17

Wikipedia:Reference desk/Archives/Mathematics/2010 May 17

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

May 18

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 May 23

1. Help for an estimate
2. Isometries of the Poincare Disc

May 24

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2010 May 28

1. What were her speeds please

May 29

Wikipedia: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

Wikipedia: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

Wikipedia: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