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Set

$ V,E $ … set
$ \langle V,\langle E,\psi\rangle\rangle \in \mathrm{it}(E,V) $
$ \psi $ … function
$ \mathrm{dom}(\psi)=E $
$ \forall (e\in E).\ \exists (u,v\in V).\ \psi(e) = \langle v,u \rangle $

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Improvements of the human condition