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Proof step 21 from proof termination-RED1 (previous step)

∀ t0. #(t0) < #(t3 _ t4 _ t2) → (¬ hasS(t0) → 〈RED1(t0; tn)〉 (tn ≠ none → ¬ hasS(tn) ∧ #(tn) < #(t0))), t3 .1 = S, t3 ≠ K, ap(t3), ¬ hasS(t2), ¬ hasS(t3), ¬ hasS(t4), ¬ (value(t3 .2) ∧ value(t4) ∧ value(t2)) ⊦ 〈RED1(t3 _ t4; tn)〉 〈t1 := t3 _ t4 ; if tn ≠ none then tn := some(tn .t _ t2) else if value(t1) then { RED1(t2; tn) ; if tn ≠ none then tn := some(t1 _ tn .t) }〉 (tn ≠ none → ¬ hasS(tn) ∧ ¬ #(t1) + #(t2) < #(tn))

Heuristic elimination applied rule insert elim lemma

And closed the goal!

Rule argument

[x0lemmaarg: spec-name: term instance-name: lemma-name: elim antecedent: succedent: ap(t) → (t0 = t .1 ∧ t1 = t .2 ↔ t = t0 _ t1) substlist: [t, t0, t1] → [t3, t, t5] add preconditions?: F is rewrite lemma?: F current spec?: F rotate lemma?: T replace all?: T paths: () dummy: () ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ t _ t0 ≠ K], [CSIMPSEQ : ⊦ ap(t _ t0)], [CSIMPSEQ : ⊦ hasS(t _ t0) ↔ hasS(t) ∨ hasS(t0)], [CSIMPSEQ : ⊦ hasS(S)], [CSIMPELIM : ⊦ ap(t) → ( t0 = t .1 ∧ t1 = t .2 ↔ t = t0 _ t1)])], [EXTRATERMS : (t3, t, t5)]]