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Theorem isobj-put-samefield-01

⊦ r -- fs ' ∈ st ∧ oktype(st[r -- fs '], fs .type, st) ∧ oktype(val, fs .type, st) ∧ fs ' ≠ _type → (is_obj(r, class, st[r -- fs ', val]) ↔ is_obj(r, class, st))

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