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Proof step 2 from proof wand-flatten (previous step)

⊦ ((P0 -* P1 -* P2))(H) ↔ ((P0 * P1 -* P2))(H)

User applied rule case distinction

And obtained the following new goals

Proof step 3:
((P0 -* P1 -* P2))(H) ⊦ ((P0 * P1 -* P2))(H)
Proof step 25:
((P0 * P1 -* P2))(H) ⊦ ((P0 -* P1 -* P2))(H)

Rule argument

pos: right 1

Additional information