Theorem s0s1

Description: Concatenation of fixed length strings. (This special case of ccatlid is provided to complete the pattern s0s1 , df-s2 , df-s3 , ...) (Contributed by Mario Carneiro, 28-Feb-2016)

	Ref	Expression
Assertion	s0s1	|- <" A "> = ( (/) ++ <" A "> )

Proof

Step	Hyp	Ref	Expression
1		s1cli	|- <" A "> e. Word _V
2		ccatlid	|- ( <" A "> e. Word _V -> ( (/) ++ <" A "> ) = <" A "> )
3	1 2	ax-mp	|- ( (/) ++ <" A "> ) = <" A ">
4	3	eqcomi	|- <" A "> = ( (/) ++ <" A "> )