# Symbols:Greek/Psi

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## Psi

The $23$rd letter of the Greek alphabet.

Minuscule: $\psi$
Majuscule: $\Psi$

The $\LaTeX$ code for $\psi$ is \psi .

The $\LaTeX$ code for $\Psi$ is \Psi .

## Mapping

$\map \psi x$

The Greek letter $\psi$, along with $\phi$ and $\chi$ and others, is often used to denote a general mapping.

In the context of abstract algebra, it often denotes a homomorphism.

The $\LaTeX$ code for $\map \psi x$ is \map \psi x .