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Proof step 2 from proof validrefs-append-01 (previous step)

validrefs(str, refs0 + r ', ty, st), validrefs(str, r ' + refs1, ty0, st) ⊦ validrefs(str, (refs0 + r ') + refs1, ty, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ validrefs(str, refs + r ', ty, st) ∧ validrefs(str, r ' + refs0, ty0, st) → validrefs(str, refs + r ' + refs0, ty, st)

Rule argument

[crewrite-arg: validrefs-append , F , [str, refs, r, ty, st, refs0, ty0] → [str, refs0, r, ty, st, refs1, ty0] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1])], [EXTRATERMS : (str, refs0, r, ty, st, refs1, ty0)]]