Definitions bool 1 Sections StandardLIB Doc
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Some definitions of interest.
assertDef b == if b True else False fi
Thm* b:b  Prop
le_intDef ij == j<i
Thm* i,j:. (ij 
bnotDef b == if b false else true fi
Thm* b:b  
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
leDef AB == B<A
Thm* i,j:. (ij Prop
lt_intDef i<j == if i<j true ; false fi
Thm* i,j:. (i<j 
notDef A == A  False
Thm* A:Prop. (A Prop

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Definitions bool 1 Sections StandardLIB Doc