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Directed graph
Set
| context | $ V,E $ … set |
| definiendum | $ \langle V,\langle E,\psi\rangle\rangle \in \mathrm{it}(E,V) $ |
| postulate | $ \psi $ … function |
| postulate | $ \mathrm{dom}(\psi)=E $ |
| postulate | $ \forall (e\in E).\ \exists (u,v\in V).\ \psi(e) = \langle v,u \rangle $ |
Discussion
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Context
