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These are some of the posts which appeared quite useful to me:

Show that Hermitian Matrices form a Vector Space

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 $\sqrt[n]{{kn \choose n}}$

Computation of: $\lim_{n\to\infty}\left(\ln\left(1+\frac{1}{n^2+1}\right)^n+\ldots+\ln\left(1+\frac{1}{n^2+n}\right)^n\right)$

$\lim_{x\to \infty}\left(\frac{2\arctan(x)}{\pi}\right)^x=? $

$\displaystyle\lim_{x\to\frac{\pi}{3}}\frac{\tan^3x-3\tan x}{\cos\Big(x+\frac{\pi}{6}\Big)}$

Limit $\lim_{n\to\infty} n^{-3/2}(1+\sqrt{2}+\ldots+\sqrt{n})=\lim_{n \to \infty} \frac{\sqrt{1} + \sqrt{2} + ... + \sqrt{n}}{n\sqrt{n}}$

Computing: $\lim_{x\to\infty}\frac{\sqrt{1-\cos^2\frac{1}{x}}\left(3^\frac{1}{x}-5^\frac{-1}{x}\right)}{\log_2(1+x^{-2}+x^{-3})}$

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

How are the integral parts of $(9 + 4\sqrt{5})^n$ and $(9 − 4\sqrt{5})^n$ related to the parity of $n$?

Variables inside nested radicals

Proving by induction that $ \sum_{k=0}^n{n \choose k} = 2^n$

University plane geometry question about splitting the diagonal of a parallelogram into 3 equal parts

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