transfinite arithmetic, cardinal arithmetic, ordinal arithmetic
prime field, p-adic integer, p-adic rational number, p-adic complex number
arithmetic geometry, function field analogy
geometry, complex numbers, complex line
$dim = 1$: Riemann surface, super Riemann surface
The complex numbers $+i$ and $-i$, i.e. the two solutions $x$ to the equation $x^2 = -1$, are the imaginary units.
A complex number of the form $y i$ with $y \in \mathbb{R}$ a real number is called a purely imaginary number.
Created on January 6, 2018 at 19:28:03. See the history of this page for a list of all contributions to it.