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Theorem size-two

⊦ # s = 2 ↔ (∃ a, b. a ≠ b ∧ s = ∅ ++ a ++ b)

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: size-two-05,
Used by units in proved state: oset,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 10
Used lemmas: in-04, size-one-01, one-size, size-one, Size-insert, indef, ne-02, ne-01, selsize, size-two-01,
Used spec theorems:
- Used simplifier rules: