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Theorem appendend-equal

⊦ σ + σ0 = σ ↔ σ0 = [] ∨ # σ = ∞

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by: leq-prefix, leq-refl, leq-symm-2, prefixself-equal,
Used by units in proved state: streamseq-mon-lim-old, mon-lim-filter-count-old,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: size-fin, append-assoc, append-cancel-l-02, notfin-sizeinf,
Used spec theorems:
- Used simplifier rules:
  - nat-inf/disj-rqui-infty
  - stream-basic/elim-finp-ant