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Theorem lastn-rec

⊦ n ≠ 0 → lastn(n, x) = lastn(n -1, x.butlast) + x.last

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: lastn-app, lastn-lastn-01, lastn-one,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: lastN-rec,
Used spec theorems:
- Used simplifier rules:
  - nat/pred-03
  - nat-basic2/oz
  - nat-basic2/a
  - nat-basic2/c
  - list/Last
  - list/app-01
  - list/a
  - nat/elim-pred-c