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Let

f:= {<0, 0>, <1, 0>, <2, 1>}.

Then

f^{-1}= {<0, 0>, <0, 1>, <1, 2>}

is *not* a function, because it contains <0, 0> and <0,
1>.

*The inverse of a function is not necessarily a function.*

Author: Wolfgang Schreiner

Last Modification: October 14, 1999