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Theorem length-from

¬ # x < n ⊦ # x.drop(n) = # x - n

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by: fin-size-from, from-append-add, from-append-tofrom, less-size-from, size-from, size-from-less, ton-fromn-fin, ton-fromn-inf,
Used by units in proved state: streamseq-mon-lim, mon-lim-filter-count, infinite-append,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas:
Used spec theorems:
- Used simplifier rules:
  - list-del/rest-len
  - nat/le-def