DiscrMathExt Sections NuprlLIB Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
Def  P XOR Q == P  Q & (P & Q)

is mentioned

In prior sections: LogicSupplement

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

DiscrMathExt Sections NuprlLIB Doc