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Reverted 1 edit by Siilversurfer (talk): "correspondence" has a different meaning in mathematics |
m Changed "functions" to "function" for improved grammar. |
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A ''multivalued function'' of sets ''f : X → Y'' is a subset
:<math> \Gamma_f\ \subseteq \ X\times Y.</math>
Write ''f(x)'' for the set of those ''y'' ∈ ''Y'' with (''x,y'') ∈ ''Γ<sub>f</sub>''. If ''f'' is an ordinary function, it is a multivalued
:<math> \Gamma_f\ =\ \{(x,f(x))\ :\ x\in X\}.</math>
They are called '''single-valued functions''' to distinguish them.
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