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Jul
1
revised Defining exponentiation on the integers
added binomial coeffs in formula
Jul
1
revised Defining exponentiation on the integers
added binomial coeffs in formula
Jul
1
answered Defining exponentiation on the integers
Jul
1
comment Defining exponentiation on the integers
of course you could. use the biomial theorem.
Jun
30
revised Logic problem involving sum of digits
typos
Jun
30
comment Logic problem involving sum of digits
@Mike: you are right, but I mentioned that one can construct other solutions by adding/removing zeros
Jun
30
comment Complex numbers $z$ satisfying $|z−a|+|z+a| = 2|b|\Leftrightarrow |a|\le |b|$.
If you draw the complex numbers as points in the plane your equation describes what kind of figure?
Jun
30
comment Complex numbers $z$ satisfying $|z−a|+|z+a| = 2|b|\Leftrightarrow |a|\le |b|$.
What is the first implication and what is the second one? Please show us the prove.
Jun
30
answered Logic problem involving sum of digits
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 $y'' + 3y' + 2y = f(t), \; y(0) = y'(0) = 0$