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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: simp, localsimp,
Comment:
Used by: appendend-equal, leq-prefix,
Used by units in proved state: mon-lim-filter-count,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: neq-fin-inf-01, fun-nonempty, append-inf, append-empty, empty, append-assoc, eq-stream-to-list-2-1, fin-empty,
Used spec theorems:
- Used simplifier rules: