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Proof step 3 from proof add-isarray (previous step)

∀ r, r0, i, class1, st. r = r0 ∨ (is_arrayref(r, i, addobj(r0, class1, fis0, st)) ↔ is_arrayref(r, i, st)) ⊦ r = r0, is_arrayref(r, i, addobj(r0, class1, fis0, st)) ↔ is_arrayref(r, i, st)

User applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 1, [extquanttermlist: (r, r0, i, class1, st) abort:F , discard:F , computed:T ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r, r0, i, class1, st)]]