| st[r -- _length] = st1[r -- _length], st[r -- _type] = st1[r -- _type], st[r0 -- sk] = st1[r0 -- sk], r1 -- sk0 ∈ st, r1 -- sk0 ∈ st1, r1 ∈ st, r1 ∈ st1, ∀ rk0. rk0 ∈ st ↔ rk0 ∈ st1, ∀ r2, sk1. r2 ≠ r → (((r2 = r1 ∧ sk1 = sk0) ⊃ val; st[r2 -- sk1])) = st1[r2 -- sk1] ⊦ r0 = r1, st1[r1 -- sk0] = val, r = r1 |
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r1, sk0)]]