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Proof step 18 from proof RED1-lem (previous step)

〈RED1(t1; tn)〉 tn = none, 〈TOPRED(t1 _ t2; tn)〉 tn = none, ∀ t0. #(t0) < #(t1 _ t2) → (true → 〈RED1(t0; tn)〉 (tn = none ⊃ irred(t0); t0 => tn .t)), t1 _ t2 => t', irred(t1), ¬ value(t1), ∀ t0. ¬ t1 _ t2 =>top t0 ⊦

User applied rule all left

And obtained the following new goals

Proof step 17:
〈RED1(t1; tn)〉 tn = none, 〈TOPRED(t1 _ t2; tn)〉 tn = none, ∀ t0. #(t0) < #(t1 _ t2) → (true → 〈RED1(t0; tn)〉 (tn = none ⊃ irred(t0); t0 => tn .t)), t1 _ t2 => t', irred(t1), ¬ value(t1), ¬ t1 _ t2 =>top t' ⊦

Rule argument

[EXRARG : pos: left 7, [extquanttermlist: (t')abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (t')]]