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Proof step 6 from proof is_obj-del (conclusion)

⊦ r ≠ r0 → (is_obj(str, r0, st -- r) ↔ is_obj(str, r0, st))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)
Proof step 2:
⊦ r ≠ r0 → (is_obj(r0, st -- r) ↔ is_obj(r0, st))
Proof step 5:
class+∃(str, st[r0 -- _type] .type .class), is_obj(r0, st) ⊦ r = r0, is_obj(str, r0, st -- r), is_abstract(st[r0 -- _type] .type .class)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ r ≠ r0 → (st -- r)[r0 -- sk0] = st[r0 -- sk0]])]]