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 May 6 accepted Check if $n=m^2$ in $\mathbb F_q$ May 6 asked Check if $n=m^2$ in $\mathbb F_q$ Apr 19 reviewed Approve Simple homotopy construction Apr 5 comment Complexity of $\gcd$ algorithm @BrianM.Scott Thank you very much. Apr 5 asked Complexity of $\gcd$ algorithm Apr 4 comment Creating random numbers matching mean and standard deviation For some reason, when reading the question I presumed he was asking for a normal distribution. I don't know why... Apr 4 answered Creating random numbers matching mean and standard deviation Apr 4 reviewed No Action Needed Creating random numbers matching mean and standard deviation Apr 4 reviewed No Action Needed Show that no non-trivial open set in $\mathbb{R}^n$ has measure zero in $\mathbb{R}^n$ Apr 4 reviewed Approve Integral of $\frac{\sin x}{1+\sin^2x}$ from 0 to $\pi/2$ Apr 3 reviewed Approve Second moment of a PGF and relation to expectation Apr 2 reviewed Approve Integration Question Mar 30 comment circle as polar coordinates @snowman There is indeed no answer. In mathematics the method is usually problem-dependent. From my point of view, what I did is more straightforward, as I'm just calculating the integral, of course a lot of times you solve integrals by doing changes of variables that are not simple isometries such as a translation-rotation. You just have to look in each case which is the best method. In this particular case the integrand is just $r$ in polar coordinates, so trying to evaluate the area of integration in those coordinates seemed to be a better option. Mar 30 comment circle as polar coordinates @snowman What you do is equivalent to translating the circle (and the function) to the left so the circle is centered at the origin. That should give the same result. What I did was just evaluate the function in the area in which we're integrating. Mar 30 comment circle as polar coordinates @snowman I edited the answer with further details about that. Mar 30 revised circle as polar coordinates added 340 characters in body Mar 30 answered circle as polar coordinates Mar 24 comment About this congruence implication you mean when $X=0$?, then it's just Fermat's little theorem. Mar 24 comment About this congruence implication Thank you so much. The second one was unneccessary, but I was reading it in a paper and they said that that was an implication of both equations. Thank you again Mar 24 accepted About this congruence implication