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Theorem last-ex

a ≠ x.last, a ∈ x ⊦ ∃ y, z. x = y + a ' + z ∧ z ≠ []

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: last-elim,
Used spec theorems:
- list/In
Used simplifier rules:
- list/in-empty
- list/in-17
- list/in-append
- list/c
- list/a
- list/e-02