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Jul
21
comment Given that $p$ is an odd prime, is the GCD of any two numbers of the form $2^p + 1$ always equal to $3$?
I don't quite get it -- if $p=2$, you get $2^p-1=5$ and if $p=3$ then $2^p+1=9$, but $gcd(5,9) \not =3$
Jul
21
revised Evaluating a cube root
added 12 characters in body
Jul
21
answered To find a extremal point of a function with parameters
Jul
21
revised To find a extremal point of a function with parameters
typo
Jul
21
revised To find a extremal point of a function with parameters
edited body
Jul
21
answered How to solve $z^3 + \overline z = 0$
Jul
21
comment Pagerank existence of a graph given a vector
@NikhilShinday new question did not come through. consider posting it as a separate question and pasting the link here
Jul
20
answered Pagerank existence of a graph given a vector
Jul
20
comment Determine all real $x$ for which the series $\sum\limits_{k=1}^\infty\frac{k^k}{k!}x^k$ converges.
if you substitute $x=1/e$ you get something very similar to the limit expression in the hint, can you use it?
Jul
20
comment Rewriting Triple Integral in different order
@sonia why don't you try yours and post the answer here, and i will check it?
Jul
20
answered how to solve a matrix equation like that
Jul
20
comment Rewriting Triple Integral in different order
@sonia here is an example of a very related problem, just not yours.
Jul
20
revised Rewriting Triple Integral in different order
added 681 characters in body
Jul
20
comment Rewriting Triple Integral in different order
see the hint in the answer
Jul
20
answered Rewriting Triple Integral in different order
Jul
20
revised Function $f(x)=2e^x/(1+e^x)$ and its critical point
deleted 2 characters in body; edited title
Jul
20
comment Rewriting Triple Integral in different order
think about the region this represents and represent it using the different variable order; the integrand does not change
Jul
20
answered Solving the inequality $2-(x/4-3)+1 \le 4-2/3x$
Jul
20
revised Solving the inequality $2-(x/4-3)+1 \le 4-2/3x$
LaTeX
Jul
20
comment Solving the inequality $2-(x/4-3)+1 \le 4-2/3x$
Welcome to Math.SE, what are your own thoughts on the problem?