Definition df-7

Description: Define the number 7. (Contributed by NM, 27-May-1999)

	Ref	Expression
Assertion	df-7	$$⊢7=6+1$$

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		c7	$$class7$$
1		c6	$$class6$$
2		caddc	$$class+$$
3		c1	$$class1$$
4	1 3 2	co	$$class\left(6+1\right)$$
5	0 4	wceq	$$wff7=6+1$$