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Proof step 15 from proof sharing-twopaths (previous step)

# sks1 = # refs0, st[r -- sks] = refval(r0), st[r -- sks0] = refval(refs0 .last), st[r0 -- sks1] = refval(refs0 .last), fits(r0, sks1, st), validrefs(str, r0 ' + refs0, mkclasstype(`java.lang.Object' .class), st), fits(r, sks, st), fits(r, sks0, st) ⊦ refs0 .last = jvmref, r0 = jvmref, sks0 = [], sks = sks0, r = jvmref, refs0 = [], sks + sks1 = sks0, sks1 = [], sks = [], sks ⊑ sks0, fits(r, sks + sks1, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 14:
⊦ fits(r, sks + sks0, st) ↔ fits(r, sks, st) ∧ fits(st[r -- sks] .refval, sks0, st)

Rule argument

[crewrite-arg: fits-append , F , [st, sks0, sks, r] → [st, sks1, sks, r] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ refval(r) .refval = r])], [EXTRATERMS : (st, sks1, sks, r)]]