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Proof step 7 from proof validref-notin-01 (conclusion)
⊦ ¬ r -- _type ∈ st → ¬ is_valid_ref(r, st)
Heuristic simplifier applied rule simplifier
And obtained the following new goals
Proof step 6
:
is_valid_ref(r, st) ⊦ r -- _type ∈ st
Rule argument
[emptyarg]
Additional information
[[CONCRETESIMPRULES : ()]]