None
Conclusion:
hyp,M,N:Formula List.
q,r:Formula.
a:Assignment.
a |
<hyp, q::(M @ N)>
a |
<hyp, r::(M @ N)>
a |
<hyp, M @ (q
r::N)>
1. a |
<hyp, q::(M @ N)>
a |
<hyp, r::(M @ N)>
a |
<hyp, M @ (q
r::N)>