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Proof step 6 from proof unchNorec-isobj-01 (previous step)

is_obj(r, st), class+∃(str, st[r -- _type] .type .class), unchangedNorec(r, st, st0) ⊦ is_abstract(st[r -- _type] .type .class), class+∃(str, st0[r -- _type] .type .class) ∧ ¬ is_abstract(st0[r -- _type] .type .class) ∧ is_obj(r, st0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ unchangedNorec(r, st, st0) ∧ is_obj(r, st) → (¬ is_obj(r, st0) ↔ false)
Proof step 5:
is_obj(r, st), class+∃(str, st[r -- _type] .type .class), unchangedNorec(r, st, st0) ⊦ is_abstract(st[r -- _type] .type .class), class+∃(str, st0[r -- _type] .type .class) ∧ ¬ is_abstract(st0[r -- _type] .type .class)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]