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Proof step 3 from proof irred-no-step-02 (previous step)

value(t1), ∀ t'. ¬ t1 _ t2 => t', t2 => t ⊦

User applied rule all left

And obtained the following new goals

Proof step 2:
⊦ t => t' ∧ value(t1) → (¬ t1 _ t => t1 _ t' ↔ false)

Rule argument

[EXRARG : pos: left 2, [extquanttermlist: (t1 _ t)abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (t1 _ t)]]