The graph of a function f\colon D\to R is the set of ordered pairs (x,y) such that x\in D,y\in R and y=f(x) .


\text{graph}(f)=\Big\{(t,f(t))\in D\times R:t\in D\Big\}\subset D\times R

i.e. \text{graph}(f) is a subset of D\times R

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