AlexR
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 Apr 17 comment How many elements are in the set $\{ \left( \frac{2+i}{2-i} \right) ^n : n \in \mathbb N\}$ @mathguy If you stress text with double asterisks (**text**), it won't look like SCREAMING Mar 28 revised Does the integral of $\int_0^2 (\ln x)^{-2}$ exist? edited title Mar 20 revised Minimum and maximum on the closed disk $\,D(0,1)-f(z)=z^2-z$ added 5 characters in body Mar 20 answered Binomial Normal Stats Mar 20 comment Binomial Normal Stats Your "probabiliteis" aren't even in $[0,1]$. That cannot possibly correct. Mar 16 comment When derivative of a function is its inverse function and vice-versa Please use a more clear notation. Is $fi$ the inverse function ($f^{-1}$), as it says in the title, or the derivative of the inverse ($\frac{\mathrm d}{\mathrm dx}f^{-1}$), as it says in the body? Mar 14 comment What is a mathematical expression for the sequence $\{1,1,-1,-1,1,1,-1,-1,\dots\}$? +1 for showing a general approach to this class of problems Mar 11 awarded Enlightened Mar 11 awarded Nice Answer Feb 20 awarded Good Answer Feb 19 awarded Enlightened Feb 19 awarded Nice Answer Feb 19 answered How to write a function from graph? Feb 19 comment Show that the area of the face of the coin is $\frac{a^2}{2}(\pi-7\tan\frac{\pi}{14})$ What have you tried so far? A small hint: Start with the $7$ sectors and work out the area you counted multiple times. Feb 19 revised Show that the area of the face of the coin is $\frac{a^2}{2}(\pi-7\tan\frac{\pi}{14})$ added 1 character in body; edited title Feb 19 comment Why is derivative of $x$ with respect to $x$ equal to $1$? @Masacroso It doesn't seem like a good idea to start learning about derivatives with nonstandard analysis if standard analysis was not even learned ;-) Feb 19 comment Why is derivative of $x$ with respect to $x$ equal to $1$? @KimPeek The first class of derivatives I learned about was in fact that of (affine) linear functions of the form $f(x) = cx+b$. Indeed more people in my class had trouble seeing that the derivative of a constant was $0$ than seeing that the derivative of $cx$ was $c$. Feb 19 answered Why is derivative of $x$ with respect to $x$ equal to $1$? Feb 7 revised Why *all* $\epsilon > 0$, in the $\varepsilon-\delta$ limit definition? edited body Feb 5 revised How did the rule of addition come to be and why does it give the correct answer when compared empirically? Grammar fix