At: formula not left falsifiable 1 1 1 1 1
1. concl: Formula List
2. M: Formula List
3. N: Formula List
4. f2: Formula
5. a: Assignment
6.
F
M.a |= F
7.
F
N.a |= F
8. a |
f2
9.
F
concl.a |
F
a |= 

f2
By: BackThru
Thm*
F:Formula, a:Assignment. a |= 

F 
a |
F
Generated subgoals:None
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