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Proof step 7 from proof disjoint-symmetric (previous step)

refs0 .last = refs .last, validrefs(str, refs, st[refs .first -- _type] .type, st), validrefs(str, refs0, st[refs0 .first -- _type] .type, st), refs0 .first ≠ r0 ∧ refs0 .first ≠ r ∨ refs .first ≠ r0 ∧ refs .first ≠ r ⊦ refs .last = jvmref, refs0 .first = refs .first, refs = [], refs0 = [], refs .first ≠ r ∧ refs .first ≠ r0, refs0 .first ≠ r ∧ refs0 .first ≠ r0

User applied rule case distinction

And closed the goal!

Rule argument

[CASEDARG : pos: left 4, ()]

Additional information

[[CONCRETESIMPRULES : ()]]