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 Apr19 reviewed Approve Simple homotopy construction Apr17 revised how to calculate number of points on an Elliptic curve over prime field? suggest any best method added 3 characters in body Apr5 comment Complexity of $\gcd$ algorithm @BrianM.Scott Thank you very much. Apr5 asked Complexity of $\gcd$ algorithm Apr5 reviewed Approve Interception Solid Apr4 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... Apr4 answered Creating random numbers matching mean and standard deviation Apr4 reviewed No Action Needed Creating random numbers matching mean and standard deviation Apr4 reviewed No Action Needed Show that no non-trivial open set in $\mathbb{R}^n$ has measure zero in $\mathbb{R}^n$ Apr4 reviewed Approve Integral of $\frac{\sin x}{1+\sin^2x}$ from 0 to $\pi/2$ Apr3 reviewed Approve Second moment of a PGF and relation to expectation Apr3 asked Existence of a number under Artin's conjecture Apr2 reviewed Approve Integration Question Mar30 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. Mar30 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. Mar30 comment circle as polar coordinates @snowman I edited the answer with further details about that. Mar30 revised circle as polar coordinates added 340 characters in body Mar30 answered circle as polar coordinates Mar24 comment About this congruence implication you mean when $X=0$?, then it's just Fermat's little theorem. Mar24 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