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Proof step 12 from proof validrefs-one (previous step)

r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty) → ¬ validrefs(str, r ' + [], ty, st) ⊦ r = jvmref, validrefs(str, r ', ty, st) ↔ is_valid_ref(str, r, st) ∧ st[r -- _type] .type ≤ ty

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ refs + [] = refs])]]