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Proof step 5 from proof isarray-union (previous step)

st[r -- _type] = typeval(mkarraytype(ty)), r ∈ st, okarray(r, ty, st), r -- _type ∈ st ⊦ r = jvmref, okarray(r, ty, st0 ∪ st)

User applied rule insert lemma

And obtained the following new goals

Proof step 4:
⊦ okarray(r, ty, st) → okarray(r, ty, st0 ∪ st)

Rule argument

[LEMMAARG : union-okarray, [r, ty, st, st0] → [r, ty, st, st0]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r, ty, st, st0)]]