At: formula imp right sound 1 1 2
1. hyp: Formula List
2. M: Formula List
3. N: Formula List
4. q: Formula
5. r: Formula
6. a: Full( < hyp,M @ (q
r.N) > )
7. a |= < q.hyp,r.(M @ N) >
a |= < hyp,M @ (qr.N) >
By: BackThru
Thm* 
hyp,M,N:Formula List, q,r:Formula, a:Assignment.
a |= < hyp,M @ (qr.N) > 
a |= < q.hyp,r.(M @ N) >
Generated subgoals:None
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