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Proof step 47 from proof validrefs-append (previous step)

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

User applied rule structural induction

And obtained the following new goals

Proof step 8:
validrefs(str, r ' + refs0, ty0, st), validrefs(str, [] + r ', ty, st) ⊦ validrefs(str, [] + r ' + refs0, ty, st)
Proof step 46:
∀ str, r, refs0, ty0, st, ty. validrefs(str, r ' + refs0, ty0, st) ∧ validrefs(str, acc + r ', ty, st) → validrefs(str, acc + r ' + refs0, ty, st), validrefs(str, r ' + refs0, ty0, st), validrefs(str, (r0 + acc) + r ', ty, st) ⊦ validrefs(str, (r0 + acc) + r ' + refs0, ty, st)

Rule argument

[VARWITHVARSEQSARG : refs, ()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : references generated by [], +;])]]