At: assignment monotone 1 1 5 1 1 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
11. a |= y1
y2
12. a | y1
a' | y1 
a' |= y2
By:
Choose [1]
THEN
HypBackchain
Generated subgoals:None
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