Quantum redactiones paginae "Graphum (mathematica)" differant

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==Definitio==
 
Sit talis functio <math> f:X \rightarrow Y, \ x\mapsto f(x).</math> Tum graphum est [[copia]] <math> G_f=\lbrace (x/y) \in X \times Y: x\in X, y=f(x) \rbrace .</math>
 
==Exempla graphorum==