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Proof step 20 from proof isvalidref-put-array-badindex (previous step)

i < 0 ⊦ (is_obj(r0, st[r0 -- i ', val]) ∨ is_array(r0, st[r0 -- i ', val])) ∧ ( class+∃(str, st[r0 -- _type] .type .class) ∧ ¬ is_abstract(st[r0 -- _type] .type .class) ∧ is_obj(r0, st) ∨ is_array(str, r0, st[r0 -- i ', val])) ↔ is_obj(str, r0, st) ∨ is_array(str, r0, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
⊦ is_obj(r, st[r0 -- i ', val]) ↔ is_obj(r, st)
Proof step 19:
i < 0 ⊦ (is_obj(r0, st) ∨ is_array(r0, st[r0 -- i ', val])) ∧ ( class+∃(str, st[r0 -- _type] .type .class) ∧ ¬ is_abstract(st[r0 -- _type] .type .class) ∧ is_obj(r0, st) ∨ is_array(str, r0, st[r0 -- i ', val])) ↔ is_obj(str, r0, st) ∨ is_array(str, r0, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]