Inverse Function Table
The invfunc table is used by solve, simplify and the `@@` operator to replace (explicit or implicit) occurrences of expressions of the form f−1 with the corresponding inverse function.
The Invfunc table is similar to the invfunc table, but returns a multiple valued inverse (in case the inverse is a multiple valued function). A multiple value function normally uses a _Z or _NN additional variable which is assumed to be in the correct domain. _Zxx variables stand for arbitrary integers, _NNxx stand for arbitrary natural numbers (non-negative integers).
Entries may be added to or deleted from the table just as for any other Maple table.
The table is uni-directional. That is, if there is an entry in the table of the form invfunc[f] = g, Maple does not assume that g−1=f.
invfunc[f] := g;
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