Mathematics
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Donlans Donlans

Apparently, this user prefers to keep an air of mystery about them.

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8 Why is this proof invalid? Sep 4 '19
6 Why is infinite intersections of all intervals $(-1/n, 1/n)$, where $n$ is positive integer, not open? Dec 20 '19
4 What's wrong with this proof? if $\sum a_n$ converges and $\sum b_n$ converges absolutely, then $\sum a_nb_n$ converges Apr 22
3 Length of a curve in the plane, help with proof May 25
3 Is the graph of $f(x) = (x^2-4)/(x-2)$ the same as $f(x) = (x+2)$? Aug 31 '19
2 a < b if and only if a++ ≤ b. May 17 '19
1 Show That the Series $\frac{1}{n}+ \frac{1}{n+1} +\dots + \frac{1}{2n}$ Converges to a Number Between $\frac{1}{2}$ and $1$ [duplicate] Jul 5 '19
1 Let $f(a) = g(a)$, $f'(x) \geq g'(x) $ for all x and that $f'(x_0) > g'(x_0)$ for some $x_0 > a$ show that $f(x) > g(x)$ for all $x \geq x_0$ Jul 30 '19
1 proof verification, relative open sets. Aug 15 '19
1 How has mathematics been done historically? [Book Reference Request] Aug 2 '19
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