| rk ∈ st ↔ rk ∈ st0, r ∈ st, r -- sk ∈ st, r -- _length ∈ st → st[r -- _length] = st0[r -- _length], r -- _type ∈ st → st[r -- _type] = st0[r -- _type], ∀ r0, sk. r0 ≠ r → st[r0 -- sk] = st0[r0 -- sk], ∀ rk. rk ∈ st ↔ rk ∈ st0 ⊦ sk = _type, sk = _length, st[r0 -- sk0] = st0[r0 -- sk0], r0 = r |
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r0, sk0)]]