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Proof step 3 from proof Data-in-putdel (previous step)

a0 ∈ (st -- a)[b, d1] ⊦ (st -- a)[b, d1][a0] = d1, ∃ a1. a1 ∈ st ∧ st[a1] = (st -- a)[b, d1][a0]

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 4:
a0 ∈ (st -- a)[b, d1] ⊦ (st -- a)[b, d1][a0] = d1, a0 = b, ∃ a1. a1 ∈ st ∧ st[a1] = (st -- a)[b, d1][a0]

Rule argument

fma: a0 = b

Additional information

Used simplifier rules: ⊦ st[a, d][a] = d; (s) Used formulas: a0 = b