Endomorphism/Unipotent/Definition

An endomorphism

${\displaystyle \varphi \colon V\longrightarrow V}$

on a ${\displaystyle {}K}$-vector space is called unipotent, if we can write

${\displaystyle {}\varphi =\operatorname {Id} _{V}+\psi \,}$

with some nilpotent mapping ${\displaystyle {}\psi }$.