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Proof step 3 from proof validrefs-postfix (previous step)

⊦ ¬ validrefs(str, refs0, st[refs0 .first -- _type] .type, st) ∧ refs0 ≠ [] → ¬ validrefs(str, [] + refs0, ty, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
validrefs(str, refs0, ty, st) ⊦ refs0 = [], validrefs(str, refs0, st[refs0 .first -- _type] .type, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ [] + refs = refs])]]