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Proof step 1 from proof sharing-com (conclusion)
⊦ P0 ⊗ P1 = P1 ⊗ P0
User applied rule expand right
And obtained the following new goals
Proof step 2
:
⊦ ((P0 ⊗ P1))(H) ↔ ((P1 ⊗ P0))(H)
Rule argument
pos: right 1
Additional information