8h
comment Law of sines: uniform proof of Euclidean, spherical & hyperbolic cases
Dear Bye_World, I very much doubt this solution can be adapted to non-euclidiean setting — but would be glad to be proven wrong.
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awarded  Promoter
8h
reviewed Close Finding non-zero eigenvalues of a $5\times 5$ matrix
8h
reviewed Close Let $y = 2au,\;$ and $\;x=a(u)^2.\;\;$ Find $\,\frac{dy}{dx}\,$
13h
reviewed Close Condinational Probability of a multinomial random variable
13h
reviewed Reviewed For every positive integer $n, n^2 + 4n + 3$ is not a prime
14h
reviewed Close Nonhomogeneous equations
14h
reviewed Close The condition of uniform convergence of $\sum a_n\sin(nx)$
14h
reviewed Leave Open How many “good” graphs of size $n$ are there?
14h
reviewed Close Showing that the Brownian Bridge is Gaussian
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reviewed Close Suppose X follows a binomial distribution with parameters n=100 and p=1/5,then prove that P(X=r) is maximum when r=33
14h
reviewed Close Convergence of distances in metric space
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reviewed Close Harmonic function condition for $ v=f(x,y)$
14h
reviewed Close Determination of area between two ellipses.
19h
revised How find all postive integer number such $(n+k)\nmid \binom{2n}{n}$
edited tags
19h
revised Counting subsets with r mod 5 elements
fixing texification
19h
revised Counting subsets with r mod 5 elements
rolled back to a previous revision
19h
comment Counting subsets with r mod 5 elements
Dear Adriano, that edit a) was quite unnecessary; b) title now looks quite ugly. I'm rolling back.
19h
reviewed Close Sigma equation statistics problem
19h
reviewed Looks OK Find the area of a region using Green's Theorem.