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Proof step 1 from proof modify+-sym (conclusion)

⊦ modify*(rs)(H0, H1) ↔ modify*(rs)(H1, H0)

User applied rule case distinction

And obtained the following new goals

Proof step 2:
modify*(rs)(H0, H1) ⊦ modify*(rs)(H1, H0)
Proof step 25:
modify*(rs)(H1, H0) ⊦ modify*(rs)(H0, H1)

Rule argument

pos: right 1

Additional information