Schreibtest

Formeln schreiben

$ A\cup B:=\{e|e\in A\lor e\in B\} $

$ \forall t,a,b\in \mathbb {N} :t\mid a\land t\mid b\Rightarrow t\mid (a+b) $ $ {\overline {AB}} $
LaTex

$ {\frac {3}{\pi }} $

Definition Parallelogramm

Das Viereck $ {\overline {ABCD}} $ heißt Parallelogramm,
wenn $ {\overline {AB}}\cong {\overline {CD}}\land {\overline {AD}}\cong {\overline {BC}} $.

$ {\overline {ABC}}\cong {\overline {A'B'C'}}:\Leftrightarrow {\overline {AB}}\cong {\overline {A'B'}}\land {\overline {BC}}\cong {\overline {B'C'}}\land {\overline {AC}}\cong {\overline {A'C'}} $