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Theorem dups-eqsize

¬ dups(x), ¬ dups(y), ∀ a. a ∈ x ↔ a ∈ y ⊦ # x = # y

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 8
Used lemmas: dups-lesize,
Used spec theorems:
- Used simplifier rules: