Definition df-cco

Description: Define the composition operation of a category. (Contributed by Mario Carneiro, 2-Jan-2017) Use its index-independent form ccoid instead. (New usage is discouraged.)

	Ref	Expression
Assertion	df-cco	$$⊢\mathrm{comp}=\mathrm{Slot}15$$

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		cco	$$class\mathrm{comp}$$
1		c1	$$class1$$
2		c5	$$class5$$
3	1 2	cdc	$$class15$$
4	3	cslot	$$class\mathrm{Slot}15$$
5	0 4	wceq	$$wff\mathrm{comp}=\mathrm{Slot}15$$