Theorem s3cli

Description: A length 3 string is a word. (Contributed by Mario Carneiro, 26-Feb-2016)

	Ref	Expression
Assertion	s3cli	$$⊢⟨“ABC”⟩\in \mathrm{Word}\mathrm{V}$$

Proof

Step	Hyp	Ref	Expression
1		df-s3	$$⊢⟨“ABC”⟩=⟨“AB”⟩\mathrm{++}⟨“C”⟩$$
2		s2cli	$$⊢⟨“AB”⟩\in \mathrm{Word}\mathrm{V}$$
3	1 2	cats1cli	$$⊢⟨“ABC”⟩\in \mathrm{Word}\mathrm{V}$$