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Proof step 4 from proof okarray-update (previous step)

∀ r, r0, ty, i, st. r = r0 ∨ (okarray(refval(r), ty, i, update(r0, fis0, st)) ↔ okarray(refval(r), ty, i, st)) ⊦ r = r0, okarray(refval(r), ty, i, update(r0, fis0, st)) ↔ okarray(refval(r), ty, i, st)

User applied rule all left

And closed the goal!

Rule argument

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

Additional information

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