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At: assignment monotone 1 1 3 1

1. f: Formula
2. x1: Formula
3. x2: Formula
4. a,a':Assignment. a' extends a (a |= x1 a' |= x1 ) & (a | x1 a' | x1)
5. a,a':Assignment. a' extends a (a |= x2 a' |= x2 ) & (a | x2 a' | x2)
6. a: Assignment
7. a': Assignment
8. a' extends a

(a |= x1x2 a' |= x1x2 ) & (a | x1x2 a' | x1x2)

By: OnHyps [-5;-6] (i.With a (Analyze i) THEN With a' (Analyze -1) THEN Analyze -1 THEN Analyze -1)

Generated subgoal:

14. a: Assignment
5. a': Assignment
6. a' extends a
7. a |= x1 a' |= x1
8. a | x1 a' | x1
9. a |= x2 a' |= x2
10. a | x2 a' | x2
(a |= x1x2 a' |= x1x2 ) & (a | x1x2 a' | x1x2)


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andimpliesall