History of complex numbers

$\ell^1$ Schur property

What is the simplest proof of the pythagorean theorem you know?

last two digits of $9^{1500}$ (Dummit Foote -Abstract Algebra preliminaries $0.3.5$)

How to find this integral $I=\int_{-\pi}^{+\pi}\frac{x\sin{x}\arctan{e^x}}{1+\cos^2{x}}dx$?

Solve $\lfloor{x}\rfloor+\lfloor2x\rfloor+\lfloor4x\rfloor+\lfloor16x\rfloor+\lfloor32x\rfloor=12345$

Meaning and Intuition behind product $\sigma$ algebras , Folland Definition

Derivation of formula for finding median for grouped data

Proving the length of angle bisector

Proof of Continuous compounding formula

If $xy$ and $x+y$ are both even integers (with $x,y$ integers), then $x$ and $y$ are both even integers

A more elegant way of computing this Wronskian?

When to do u-substitution and when to integrate by parts

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