Def p  q == if p true else q fi

is mentioned by

Def fib(n) == if n=0  n=1 1 else fib(n-1)+fib(n-2) fi  (recursive)

[fib]

In prior sections: bool 1

Try larger context: StandardLIB IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html