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Proof step 22 from proof hasSharing-def-better (previous step)

st[r0 -- sks] = refval(r0), fits(r0, sks, st) ⊦ sks = [], r0 = jvmref, ∃ sks1, sks2. fits(r0, sks1, st) ∧ fits(r0, sks2, st) ∧ sks1 ≠ sks2 ∧ sks1 ≠ [] ∧ sks2 ≠ [] ∧ st[r0 -- sks1] .refval ≠ jvmref ∧ st[r0 -- sks1] = st[r0 -- sks2]

User applied rule exists right

And obtained the following new goals

Proof step 21:
st[r0 -- sks] = refval(r0), fits(r0, sks, st) ⊦ sks = [], r0 = jvmref, fits(r0, sks, st) ∧ fits(r0, sks + sks, st) ∧ sks ≠ sks + sks ∧ sks ≠ [] ∧ sks + sks ≠ [] ∧ st[r0 -- sks] .refval ≠ jvmref ∧ st[r0 -- sks] = st[r0 -- (sks + sks)]

Rule argument

[EXRARG : pos: right 3, [extquanttermlist: (sks, sks + sks) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (sks, sks + sks)]]