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Theorem from-append-add

⊦ ¬ # σ < ⌜n⌝ ∧ ¬ # σ0 < ⌜n1⌝ → ⌜σ to n⌝ + σ0 from n1 + n = σ0 from n1

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 4
Proof steps: 9
Used lemmas: get-from-01, sel-fin, from-fin, from-appfin, length-from, size-fin, get-from-inf, get-to, append-fininf, sel-inf, size-inf, from-inf, get-from, append-assoc, size-to, size-to-02, size-append, less-size-from, fin-size-from, extensionality,
Used spec theorems:
- list-del/get-append-grt
Used simplifier rules: