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Proof step 9 from proof validrefs-trans-01 (previous step)

¬ ¬ validrefs(str, r ' + refs1, st[r -- _type] .type, st), validrefs(str, r ', ty, st), validrefs(str, r ' + refs1, ty0, st) ⊦ validrefs(str, r ' + refs1, ty, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
validrefs(str, r ' + refs1, ty0, st), validrefs(str, r ', ty, st), validrefs(str, r ' + refs1, st[r -- _type] .type, st) ⊦ validrefs(str, r ' + refs1, ty, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]