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Some definitions of interest.
f91 Def f91(i) == if 100 < i i-10 else f91(f91(i+11)) fi (recursive)
Thm* i:. f91(i)
lt_int Def i < j == if i < j true ; false fi
Thm* i,j:. (i < j)
nat Def == {i:| 0i }
Thm* Type

About:
boolbfalsebtrueifthenelseintnatural_numberaddsubtractless
setrecursive_def_noticeuniversememberall!abstraction

Definitions graph 1 1 Sections Graphs Doc