Definition df-s3 11512

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 11505	. 2 class <" A B C ">
5	1, 2	cs2 11504	. . 3 class <" A B ">
6	3	cs1 11366	. . 3 class <" C ">
7		cconcat 11341	. . 3 class ++
8	5, 6, 7	co 6079	. 2 class ( <" A B "> ++ <" C "> )
9	4, 8	wceq 1402	1 wff <" A B C "> = ( <" A B "> ++ <" C "> )

This definition is referenced by:  s3eqd  11526  s3cld  11534  s3fv0g  11546  s3fv1g  11547  s3fv2g  11548  s1s2d  11549  s1s3d  11550  s2s2d  11555  s4s3d  11557  s3s4d  11558  konigsberglem1  16712  konigsberglem2  16713  konigsberglem3  16714