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At:
nat prime div each factor1111a1 1. X :
2. prime(X)
3. W:. 0<WW<X (t:. X | tWX | t)
4. a :
5. b :
6. X | ab 7. x :
8. r : X 9. a = xX+r 10. y :
11. s : X 12. b = yX+s 13. r = 0
14. e :
15. ab = Xe X | rs
By:
Rewrite-1 by a = xX+r ...a THEN Rewrite'-1 by b = yX+s ...a