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Theorem lb

⊦ x ≠ [] → # x.butlast = # x - 1

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: butlast-len, lb-01, nodups-butlastn, postfix-split-stronger,
Used by units in proved state: list-del, mon-lim-filter-count,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 4
Proof steps: 4
Used lemmas: last-elim,
Used spec theorems:
- Used simplifier rules:
  - nat/elim-pred-c
  - list-data/l
  - list/len
  - list/len-02
  - list/a
  - nat-basic2/eq-01
  - nat-basic2/a
  - nat-basic2/c