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Proof step 12 from proof lookup-append (previous step)

sks1 = [] ∨ (∀ sks0, st, r. sks0 = [] ∨ st[r -- (sks1 + sks0)] = st[st[r -- sks1] .refval -- sks0]) ⊦ sks1 = [], sks0 = [], st[r -- ((sk ' + sks1) + sks0)] = st[st[r -- (sk ' + sks1)] .refval -- sks0]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
∀ sks0, st, r. sks0 = [] ∨ st[r -- (sks1 + sks0)] = st[st[r -- sks1] .refval -- sks0] ⊦ sks1 = [], sks0 = [], st[r -- ((sk ' + sks1) + sks0)] = st[st[r -- (sk ' + sks1)] .refval -- sks0]

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]