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Theorem rm-size-03

⊦ # rmdup(x + y) ≤ # rmdup(y) → # rmdup(x + y) = # rmdup(y)

Type: A user defined theorem
Validity: The proof is valid.
Features: forward, localforward,
Comment:
Used by:
Used by units in proved state: list-set,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 2
Used lemmas: rm-in-02, rm-nodups, dups-lesize, rm-empty,
Used spec theorems:
- Used simplifier rules:
  - list-data/l
  - nat-basic1/f
  - nat/lels-02
  - nat/ls-le-simp
  - list/in-12
  - list/a