How do you read "$a_n$" in English?

Filters vs nets in topology

contour integration of a function with two branch points .

Under what choice assumptions is there a monoid structure on every set?

Formula for the $n$th term of $1, 2, 2, 3, 3, 3, 4, 4 ,4, 4, 5, ...$

What is the practical difference between abstract index notation and "ordinary" index notation

Can a function with just one point in its domain be continuous?

How to find an all-in-one 2D to 3D Transformation Matrix for perspective projection, rotation, and translation?

Poisson Distribution and Median

Prove that $\sum_{n\leq x}d^2(n)=O(x\log^3 x)$

Coordinates (in vectors space and on manifold)

$\mathbb{Z}[X]/(X^2-1)$ is not isomorphic with $\mathbb{Z}\times \mathbb{Z}$

show that $\int_{0}^{\infty}\frac{x\cos ax}{\sinh x}dx=\frac{\pi^2}{4} \operatorname{sech}^2 \left(\frac{a\pi}{2}\right) $

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