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Intereting Posts

Proof that $\mathrm{ker}(f^*) = \mathrm{im}(f)^{\perp} $
Is it true that $\mathbb{C}(x) \equiv \mathbb{C}(x, y)$?
Find the limit $ \lim_{n \to \infty}\left(\frac{a^{1/n}+b^{1/n}+c^{1/n}}{3}\right)^n$
Evaluate $\int \cos^3 x\;\sin^2 xdx$
On equivalent definitions of Ext
Probability of $n$ successes in a row at the $k$-th Bernoulli trial… geometric?
Closed form for the integral $\int_{0}^{\infty}\frac{\ln^{2}(x)\ln(1+x)}{(1-x)(x^{2}+1)}dx$
Yet another definition of Lebesgue integral
Show that $ \sum_{n=2}^m \binom{n}{2} = \binom{m+1}{3}$
Find $\lim\limits_{n \to \infty}\left(1-\frac{1}{2^2}\right)\left(1-\frac{1}{3^2}\right)\cdots\left(1-\frac{1}{n^2}\right)$
How to find the sum of $i(i+1)\cdots(i+k)$ for fixed $k$ between $i = 1$ and $n$?
Find all homomorphisms from a quotient polynomial ring $\mathbb{Z} /(15X^2+10X-2)$ to $\mathbb{Z}_7$
There are at least three mutually non-isomorphic rings with $4$ elements?
When do the multiples of two primes span all large enough natural numbers?
Proof that sum of first $n$ cubes is always a perfect square