Definitions DiscreteMath Sections DiscrMathExt Search Doc
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Explain inverse functions and

Def  InvFuns(ABfg) == g o f = Id & f o g = Id

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functionequaland!abstraction
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions DiscreteMath Sections DiscrMathExt Search Doc