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Theorem append-cancel-l-02

⊦ σ0 + σ = σ0 ↔ σ = [] ∨ ¬ finp(σ0)

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by: append-toinf-ls, appendend-equal, toinftoinf-append-add,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 7
Used lemmas: neq-fin-inf-01, fun-nonempty, append-inf, append-assoc, append-empty, empty, eq-stream-to-list-2-1, fin-empty,
Used spec theorems:
- Used simplifier rules: