Some definitions of interest.
exp	Def exp(m;n) == if n=0 then 1 else mexp(m;n-1) fi   (recursive)
	Thm* m,n:. exp(m;n)
label	Def t  ...$L == t
nat	Def  == {i:| 0i }
	Thm*   Type
	Thm*   S

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