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Proof step 40 from proof ex-lst-shift (conclusion)

⊦ (o[_∃ xv] * R)[rs, cf, af] ↔ (∃ x. (o[xv(x)] * R)[rs, cf, af])

User applied rule case distinction

And obtained the following new goals

Proof step 19:
(o[_∃ xv] * R)[rs, cf, af] ⊦ ∃ x. (o[xv(x)] * R)[rs, cf, af]

Rule argument

[CASEDARG : pos: right 1, ()]

Additional information

[[CONCRETESIMPRULES : ()]]