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At: assignment monotone 1 1 5 1 1
1. f: Formula
2. y1: Formula
3. y2: Formula
4. a: Assignment
5. a': Assignment
6. a' extends a
7. a |= y1 a' |= y1
8. a | y1 a' | y1
9. a |= y2 a' |= y2
10. a | y2 a' | y2

(a |= y1y2 a' |= y1y2 ) & (a | y1y2 a' | y1y2)
By:
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THEN
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Generated subgoals:

111. a |= y1y2
a' |= y1y2
211. a | y1y2
a' | y1y2

About:
andimplies