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Theorem append-cut1

⊦ σ + σ1 = σ + σ2 ↔ σ1 = σ2 ∨ # σ = ∞

Type: A user defined theorem
Validity: The proof is valid.
Features: simp,
Comment:
Used by:
Used by units in proved state: mon-lim-filter-count, streamseq-mon-lim,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 1
Used lemmas: size-inf, append-inf, size-fin, append-assoc, append-cancel-l,
Used spec theorems:
- Used simplifier rules:
  - stream-basic/inj-01
  - nat-inf-basic/disj