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Graph of a function

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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).


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

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

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