Definition df-bj-pr2

Description: Definition of the second projection of a class tuple. New usage is discouraged because the precise definition is generally unimportant compared to the characteristic properties bj-pr2eq , bj-pr22val , bj-pr2ex . (Contributed by BJ, 6-Oct-2018) (New usage is discouraged.)

	Ref	Expression
Assertion	df-bj-pr2	⊢ pr2 𝐴 = ( 1o Proj 𝐴 )

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		cA	⊢ 𝐴
1	0	bj-cpr2	⊢ pr2 𝐴
2		c1o	⊢ 1o
3	2 0	bj-cproj	⊢ ( 1o Proj 𝐴 )
4	1 3	wceq	⊢ pr2 𝐴 = ( 1o Proj 𝐴 )