Graphum[1] est quaedam imago functionis alicuius in systemate coodinatarum.
Sit talis functio f : X → → --> Y , x ↦ ↦ --> f ( x ) . {\displaystyle f:X\rightarrow Y,\ x\mapsto f(x).} Tum graphum est copia G f = { ( x / y ) ∈ ∈ --> X × × --> Y : x ∈ ∈ --> X , y = f ( x ) } . {\displaystyle G_{f}=\lbrace (x/y)\in X\times Y:x\in X,y=f(x)\rbrace .}
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