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Proof step 11 from proof validrefs-one (previous step)

¬ 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

User applied rule case distinction

And obtained the following new goals

Proof step 10:
is_valid_ref(str, r, st) ∧ st[r -- _type] .type ≤ ty, ¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty → ¬ validrefs(str, r ', ty, st) ⊦ validrefs(str, r ', ty, st), r = jvmref

Rule argument

[CASEDARG : pos: right 2, ()]

Additional information

[[CONCRETESIMPRULES : ()]]