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Jun
30
comment Are 7 and 49 coprime?
@Ben: better than "Thanks": accept the answer.
Jun
30
comment Logic problem involving sum of digits
$11101110111^2=123234645696546432321$ is another one
Jun
30
comment Logic problem involving sum of digits
@Donkey Kong: No, $S(n^2)$ means squaring the number $n$ and then taking the sum of digit.
Jun
16
awarded  Nice Answer
Jun
5
awarded  Revival
May
22
awarded  Yearling
Mar
26
revised What skill do I lack to factor multivariate polynomials?
typo
Mar
26
revised What skill do I lack to factor multivariate polynomials?
added 318 characters in body
Mar
26
answered What skill do I lack to factor multivariate polynomials?
Jan
19
reviewed Approve How to prove $f(c) = f(d) = 0$
Jan
18
reviewed Approve Laplace transform of $y'' + 3y' + 2y = f(t), \; y(0) = y'(0) = 0$
Jan
16
comment Cubes differences and primality
I completed the prove, I hope there are no errors. But I can't see how that will help you to avoid trial an error. Can you explain this?
Jan
16
revised Cubes differences and primality
latex
Jan
16
revised Cubes differences and primality
parantheses
Jan
16
comment Cubes differences and primality
@Ross Millikan, thank's
Jan
16
revised Cubes differences and primality
typos
Jan
16
revised Cubes differences and primality
added 1115 characters in body
Jan
16
answered Cubes differences and primality
Jan
15
reviewed Reject Determining the sigma notation for the series: 1 + 2 - 3 + 4 - 5 + 6 - 7 + 8 - 9 . . . . .?
Jan
12
comment Is there an intuitive explanation for $ x^2+y^2=7 z^2 $ doesn't have any integer solution?
I still I can't see where you use the fact that $x^2+y^2=z^2$ has infinite integer solutions.