Linear mapping/Eigenspace/Definition

Eigenspace

Let ${}K$ be a field, ${}V$ a ${}K$-vector space and

$\varphi \colon V\longrightarrow V$

a linear mapping. For ${}\lambda \in K$, we denote by

${}\operatorname {Eig} _{\lambda }{\left(\varphi \right)}:={\left\{v\in V\mid \varphi (v)=\lambda v\right\}}\,$

the eigenspace of ${}\varphi$ for the value ${}\lambda$.