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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.
Jan
12
comment Is there an intuitive explanation for $ x^2+y^2=7 z^2 $ doesn't have any integer solution?
That is neither a answer to the question ("Does this fact ...") nor does this give us a complete answer to the more usefull question: what are the integer solutions of the equation.
Jan
11
awarded  Announcer
Jan
10
comment how can I prove that $\frac{\arctan x}{x }< 1$?
@enzolib: thanks, I added this to the answer.
Jan
10
revised how can I prove that $\frac{\arctan x}{x }< 1$?
incorporated the comment of @enzolib
Jan
10
revised how can I prove that $\frac{\arctan x}{x }< 1$?
added 223 characters in body