At: formula not left sound 1 1 2
1. concl: Formula List
2. M: Formula List
3. N: Formula List
4. f2: Formula
5. a: Full( < M @ (
f2.N),concl > )
6. a |= < M @ N,f2.concl >
a |= < M @ (f2.N),concl >
By: BackThru
Thm* 
concl,M,N:Formula List, f2:Formula, a:Assignment.
a |= < M @ N,f2.concl > 
a |= < M @ (f2.N),concl >
Generated subgoals:None
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