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At: assignment monotone 1 1 3 1 1 1
1. f: Formula
2. x1: Formula
3. x2: Formula
4. 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
11. a |= x1x2

a' |= x1x2
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 |= x1
13. a |= x2
a' |= x1x2

About:
implies