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Don't have much time these days...


12h
revised $x^2-y^2=2s$, s cannot be an odd integer
edited tags
1d
revised Integer part of a sum (floor)
added 191 characters in body
1d
revised A curious identity of weighted sums over multi-set permutations.
edited title
2d
revised Is this an accurate proof that no perfect square is of the form $4k+3$? ($k$ an integer)
edited tags
2d
revised Integer part of a sum (floor)
calculus and precalculus are contradictory. Removing precalculus.
Dec
15
revised A finite sum over $\pm 1$ vectors
edited body
Dec
15
revised A finite sum over $\pm 1$ vectors
added 16 characters in body
Dec
5
revised How can I prove analytically the number $2^{100000}+1$ is not prime??
edited tags
Dec
5
revised 4th grade word problem
edited tags
Dec
5
revised Does anyone know about Ramanujan's method of solving the quartic?
edited tags
Dec
3
revised combinatorics problem counting
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Dec
1
revised Six digit perfect square (with conditions)
edited tags
Nov
30
revised Convergence of $\sum _{n=1}^{\infty \:}\frac{\sqrt{n+1}-\sqrt{n}}{\sqrt{n}}$
edited title
Nov
30
revised convoluted recurrence: $f(2n)=f(n)+f(n+1)+n, f(2n+1)=f(n)+f(n-1)+1$
edited tags; edited title
Nov
29
revised Any $5$ element subset of $\{1,\dots, 9\}$ contains an arithmetic progression.
more descriptive titles, please.
Nov
18
revised What algorithm is used by computers to calculate logarithms?
deleted 60 characters in body
Aug
13
revised Where can I download the approx 1500 Appel-Haken reducible configurations in the Four-Color-Theorem proof?
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Aug
12
revised Truncated alternating binomial sum
added 310 characters in body
Aug
5
revised Elementary proof there are infinitely many primes of the form $4n+1$
edited tags
Jul
31
revised How prove $7\mid abcd$, if $a^{14}+b^{14}+c^{14}=d^{14}$
edited tags