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At: assignment monotone 1 1 5 1 1 2
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 | y1y2

a' | y1y2
By:
FwdThru Thm* a:Assignment, q,r:Formula. a | qr a |= q & a | r [-1]
THEN
Sel 2 (FwdThru Thm* a:Assignment, q,r:Formula. a | qr a |= q & a | r [-2])
Generated subgoal:

112. a |= y1
13. a | y2
a' | y1y2

About:
implies