Definitions num thy 1 Sections StandardLIB Search Doc
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Some definitions of interest.
assocedDef a ~ b == a | b & b | a
Thm* a,b:. (a ~ b Prop
gcdDef gcd(a;b) == if b=0 a else gcd(b;a rem b) fi  (recursive)
Thm* a,b:. gcd(a;b 

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

Definitions num thy 1 Sections StandardLIB Search Doc