Definitions mb event system 2 Sections EventSystems Doc
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Some definitions of interest.
IdDef Id == Atom
Thm* Id  Type
eq_idDef a = b == eqof(IdDeq)(a,b)
Thm* a,b:Id. a = b  
assertDef b == if b True else False fi
Thm* b:b  Prop
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop

About:
productboolifthenelseassertatomapplyuniversemember
propimpliesandfalsetrueall!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions mb event system 2 Sections EventSystems Doc