is mentioned
In prior sections: DiscreteMath
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
B == {fg:((A
B)
(BA))| fg/f,g. InvFuns(A;B;f;g) }B == {fg:((AB)(BA))| fg/f,g. InvFuns(A;B;f;g) }