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Theorem len-01

⊦ # x = # z → (x + y = z + y0 ↔ x = z ∧ y = y0)

Type: A user defined theorem
Validity: The proof is valid.
Features: ws, lws,
Comment:
Used by: len-06,
Used by units in proved state: list-del, olist-min-max, olist, filter-count, assoclist, stream, string-less, path-reachable, list-last,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 7
Used lemmas: c-06, in-rec, in-append, in-14, c, len-02, len, a, Nil,
Used spec theorems:
- Used simplifier rules: