Def P  Q == P+Q

is mentioned

In prior sections: core bool 1 int 2 list 1 sqequal 1 rel 1 mb nat mb list 1 num thy 1 mb list 2 mb event system 2 mb event system 4 mb event system 5 mb event system 6 mb event system 7 mb event system 3

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