Theorem s2cli

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

	Ref	Expression
Assertion	s2cli	$$⊢⟨“AB”⟩\in \mathrm{Word}\mathrm{V}$$

Proof

Step	Hyp	Ref	Expression
1		df-s2	$$⊢⟨“AB”⟩=⟨“A”⟩\mathrm{++}⟨“B”⟩$$
2		s1cli	$$⊢⟨“A”⟩\in \mathrm{Word}\mathrm{V}$$
3	1 2	cats1cli	$$⊢⟨“AB”⟩\in \mathrm{Word}\mathrm{V}$$