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Proof step 20 from proof isobj-union-01 (previous step)

st[r -- _type] .type = mkclasstype(class), r -- _type ∈ st, is_typevalue(st[r -- _type]), is_classtype(st[r -- _type] .type), is_obj(r, class, st), r ∈ st ⊦ r = jvmref, is_obj(r, class, st0 ∪ st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 19:
st[r -- _type] .type = mkclasstype(class), r ∈ st, is_obj(r, class, st), is_typevalue(st[r -- _type]), r -- _type ∈ st ⊦ r = jvmref, is_obj(r, class, st0 ∪ st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_classtype(mkclasstype(class))])]]