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At: assignment monotone 1

1. a: Assignment
2. f: Formula
3. a': Assignment
4. a' extends a

(a |= f a' |= f ) & (a | f a' | f)

By: OnHyps [-1;-1;-2] MoveToConcl

Generated subgoal:

11. f: Formula
a,a':Assignment. a' extends a (a |= f a' |= f ) & (a | f a' | f)


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andimpliesall