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These are some of the posts which appeared quite useful to me:
Quick way to find eigenvalues of anti-diagonal matrix
Prove that every operator on an odd-dimensional real vector space has an eigenvalue using induction.
If the sum of eigenvectors is an eigenvector, then they all correspond to the same eigenvalue
Upper bound for the rank of a nilpotent matrix , if $A^2 \ne 0$
Transpose of composition of functions
Is there any non zero matrix whose adjoint is a zero matrix
A function continuous on all irrational points
Do the real numbers and the complex numbers have the same cardinality?
The sum of an uncountable number of positive numbers
Is the following structure a group?
Finding the limit of $\sqrt[n]{{kn \choose n}}$
$\lim_{x\to \infty}\left(\frac{2\arctan(x)}{\pi}\right)^x=? $
$\displaystyle\lim_{x\to\frac{\pi}{3}}\frac{\tan^3x-3\tan x}{\cos\Big(x+\frac{\pi}{6}\Big)}$
Compute $\lim \limits_{x\to 0}\frac{\ln(1+x^{2018} )-\ln^{2018} (1+x)}{x^{2019} }$
Calculate limit using Stolz-Cesàro theorem
Determine $\lim_{n \to \infty} a_n$
Why is $\lim_{n \to +\infty }{\sqrt[n]{a_1 a_2 \cdots a_n}} =\lim_{n \to +\infty}{a_n}$
Find $\lim_{n \to \infty}\frac{\sin 1+2\sin \frac{1}{2}+\cdots+n\sin \frac{1}{n}}{n}$
Finding the limit of $\frac {n}{\sqrt[n]{n!}}$
Does the sum of reciprocals of primes converge?
Simple proof Euler–Mascheroni $\gamma$ constant
Variables inside nested radicals
Proving by induction that $ \sum_{k=0}^n{n \choose k} = 2^n$
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