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Proof step 12 from proof pathex-def-simple (previous step)

¬ (validrefs(str, r ' + refs1, st[r -- _type] .type, st) ∧ st[r -- _type] .type ≤ mkclasstype(`java.lang.Object' .class)), validrefs(str, r ' + refs1, st[r -- _type] .type, st) ⊦ validrefs(str, r ' + refs1, mkclasstype(`java.lang.Object' .class), st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
validrefs(str, r ' + refs1, st[r -- _type] .type, st) ⊦ validrefs(str, r ' + refs1, mkclasstype(`java.lang.Object' .class), st), st[r -- _type] .type ≤ mkclasstype(`java.lang.Object' .class)

Rule argument

[emptyarg]

Additional information

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