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At:
prime factorization includes prime divisors a:, b:, f:({a..b}), p:.
is_prime_factorization(a; b; f)
prime(p) p | {a..b}(f) p {a..b} & 0<f(p)
By:
IntroduceGuardForms (<prop> & <prop>) 0
THEN
Def of {<int>..<int>}(<exponents>) ...