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At:
iter nat prod one iff factors one1 1. a : b:, e:({a..b}). (i:{a..b}. e(i)) = 1 (And i:{a..b}. e(i) = 1)
By:
b:, e:({a..b}).
ab ((i:{a..b}. e(i)) = 1 (And i:{a..b}. e(i) = 1))
Asserted
THEN
UnivCD