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Intereting Posts

Show $\sum\limits_{d|n}\phi(d) = n$.
Why this definition of integrability by sup and inf integrals is necessary?
Accurate identities related to $\sum\limits_{n=0}^{\infty}\frac{(2n)!}{(n!)^3}x^n$ and $\sum\limits_{n=0}^{\infty}\frac{(2n)!}{(n!)^4}x^n$
Notation in Hartshorne Exercise 1.2.6
Closed form for an infinite series of Bessel functions
if R is a commutative ring in which all the prime ideals are finitely generated then R is Noetherian
Given $y_n=(1+\frac{1}{n})^{n+1}$ show that $\lbrace y_n \rbrace$ is a decreasing sequence
Product of two negative numbers is positive
Two covering spaces covering each other are equivalent?
Criterion for being a simple group
What is a function?
Exercise 31 from chapter 4 (“Hilbert Spaces: An Introduction”) of Stein & Shakarchi's “Real Analysis”
Proof that $\gcd$ divides $\operatorname{lcm}$
Global sections of a tensor product of vector bundles on a smooth manifold
Interpreting the Cayley-Hamilton theorem