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Theorem ex-first-nontau

ext !(α) ≠ [] ⊦ ∃ n. ⌜n⌝ < # α ∧ ext(α[n]) ≠ None ∧ (∀ m. m < n → ext(α[m]) = None)

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: remtau-split-one,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 5
Proof steps: 8
Used lemmas: remtau-empty-equiv,
Used spec theorems:
- Used simplifier rules: