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Proof step 11 from proof modify-sym (previous step)

⊦ r = null, r ∈ H0, r ∈ rs, ∃ n. rtc(n, modify(rs))(H0 ++ r, H0)

User applied rule exists right

And obtained the following new goals

Rule argument

pos: right 4 terms: 1 abort: F discard: T computed: F

Additional information

Used terms: 1