Seien ${\displaystyle {}U,V,W}$ euklidische Vektorräume und seien ${\displaystyle {}\varphi :U\longrightarrow V}$ und ${\displaystyle {}\psi :V\longrightarrow W}$ differenzierbare Abbildungen. Es sei ${\displaystyle {}\varphi }$

${\displaystyle {}P\in U}$

${\displaystyle {}\psi }$

${\displaystyle {}Q=\varphi (P)\in V}$

${\displaystyle {}\psi \circ \varphi }$

${\displaystyle {}P}$