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Theorem remtau-toempty-from

¬ # α < ⌜n⌝ , ∀ m. m < n → ext(α[m]) = None ⊦ ext !(α) = ext !(α.drop(n))

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 5
Proof steps: 9
Used lemmas: remtau-empty-equiv, finremtau-def, remtau-append,
Used spec theorems:
- stream/get-append-ls
Used simplifier rules: