Some definitions of interest.
is_prime_factorization	Def  is_prime_factorization(a; b; f) == i:{a..b}. 0<f(i)  prime(i)
	Thm*  a,b:, f:({a..b}). is_prime_factorization(a; b; f)  Prop
int_seg	Def  {i..j} == {k:| i  k < j }
	Thm*  m,n:. {m..n}  Type
nat	Def   == {i:| 0i }
	Thm*    Type
sq_stable	Def  SqStable(P) == P  P
	Thm*  A:Prop. SqStable(A)  Prop

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