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Theorem length-from

¬ # x < n ⊦ #(x from n) = # x - n

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: fin-size-from, fin-size-from2, from-append-add, from-append-tofrom, less-size-from, lslen-fromnotempty-list, size-from-less, swap-from-to, swap-to-from-app, ton-fromn-fin, ton-fromn-inf,
Used by units in proved state: streamseq-mon-lim, inf-app-list, infinite-append,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 8
Used lemmas: from-succ-cons-l-lem, from-zero-l,
Used spec theorems:
- Used simplifier rules: