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21h
revised An algorithm for making conditionally convergent series take arbitrary values?
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21h
comment Properties of zero-diagonal symmetric matrices
@Keivan, you mean a "symmetric unreduced tridiagonal matrix". If $\mathbf A$ has repeated eigenvalues, the resulting matrix is a direct sum of tridiagonal matrices (alternatively, has zeroes on the off-diagonals).
Jan
28
awarded  Good Answer
Jan
14
awarded  Necromancer
Dec
20
awarded  Good Answer
Dec
20
awarded  Guru
Dec
16
revised How many combinations are possible?
edited tags
Dec
13
comment I like math, but can't keep up with the pace.
You will fail to get the required intuition at times, yes. But you have to try again after.
Dec
13
comment I like math, but can't keep up with the pace.
...and why are you so afraid of sinking? Can you not try again after?
Dec
13
comment Is there a means of finding an infinite sum by means of altering it into an integral?
The other possibility is to express the sum as a contour integral, with the summand multiplied by a factor with poles at the right places.
Dec
13
revised Convergence of $\sum_{k=1}^{n} f(k) - \int_{1}^{n} f(x) dx$
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Dec
13
comment Is there a means of finding an infinite sum by means of altering it into an integral?
Alternatively, look up the Abel-Plana formula.
Dec
12
awarded  Revival
Dec
12
revised What's the area of the shape defined by all points whose distances from two focal points multiply to give the same product?
deleted 5 characters in body
Dec
12
comment Sum of the Stieltjes constants? (divergent summation)
Then, it is possible that PARI/GP's algorithms are unable to handle this. In Mathematica, I used the double exponential quadrature method of Takahasi and Mori.
Dec
12
revised Computing the Integral $\int r^2 \text{J}_0(\alpha r) \text{I}_1(\beta r)\text{d}r$
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Dec
12
comment Generalization for Stirling numbers 2nd kind to negative column-indexes?
So, doesn't that reflection relation answer the question in your title?
Dec
12
comment What is the sum of Psi/Digamma-function of consecutive arguments? Is there a closed form?
@Kirill, are you sure of all those digits you quoted? My own experiments of summation + extrapolation only seem to guarantee the first six significant digits of your result, which makes me suspicious of your other digits.
Dec
12
comment Sum of the Stieltjes constants? (divergent summation)
Have you tried taking the imaginary part before integrating?