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Theorem size-two-06

⊦ a ∈ s ∧ b ∈ s ∧ a ≠ b → 2 ≤ # s

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 8
Used lemmas: size-zero-02, Size-insert, size-less-01, rax, In-empty, Size-empty, gen, ne-02, ne-01,
Used spec theorems:
- Used simplifier rules: