Definition df-s3 11442

Description: Define the length 3 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)

Assertion

Ref	Expression
df-s3	|- <" A B C "> = ( <" A B "> ++ <" C "> )

Detailed syntax breakdown of Definition df-s3

Step	Hyp	Ref	Expression
1		cA	. . 3 class A
2		cB	. . 3 class B
3		cC	. . 3 class C
4	1, 2, 3	cs3 11435	. 2 class <" A B C ">
5	1, 2	cs2 11434	. . 3 class <" A B ">
6	3	cs1 11296	. . 3 class <" C ">
7		cconcat 11271	. . 3 class ++
8	5, 6, 7	co 6049	. 2 class ( <" A B "> ++ <" C "> )
9	4, 8	wceq 1398	1 wff <" A B C "> = ( <" A B "> ++ <" C "> )

This definition is referenced by:  s3eqd  11456  s3cld  11464  s3fv0g  11476  s3fv1g  11477  s3fv2g  11478  s1s2d  11479  s1s3d  11480  s2s2d  11485  s4s3d  11487  s3s4d  11488  konigsberglem1  16470  konigsberglem2  16471  konigsberglem3  16472