Theorem s2cli

Description: A doubleton word is a word. (Contributed by Mario Carneiro, 26-Feb-2016)

	Ref	Expression
Assertion	s2cli	⊢ ⟨“ 𝐴 𝐵 ”⟩ ∈ Word V

Proof

Step	Hyp	Ref	Expression
1		df-s2	⊢ ⟨“ 𝐴 𝐵 ”⟩ = ( ⟨“ 𝐴 ”⟩ ++ ⟨“ 𝐵 ”⟩ )
2		s1cli	⊢ ⟨“ 𝐴 ”⟩ ∈ Word V
3	1 2	cats1cli	⊢ ⟨“ 𝐴 𝐵 ”⟩ ∈ Word V