| 释义 |
graph (of a function or mapping) For a function f :S→T the graph of f is the subset {(s,f (s)) | s ∈ S} of the Cartesian product S×T. Note that for each s ∈ S there is a unique t ∈ T such that (s,t) is in the graph; some authors define functions as such subsets of the Cartesian product of the domain and codomain. It is common to refer to or label the graph of real function f :R→R as simply y = f(x), and surfaces in R3 often arise as graphs z = f(x,y).
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