Definition df-bj-pr2 34733

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 34734, bj-pr22val 34737, bj-pr2ex 34738. (Contributed by BJ, 6-Oct-2018.) (New usage is discouraged.)

Assertion

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

Detailed syntax breakdown of Definition df-bj-pr2

Step	Hyp	Ref	Expression
1		cA	. . 3 class 𝐴
2	1	bj-cpr2 34732	. 2 class pr2 𝐴
3		c1o 8106	. . 3 class 1o
4	3, 1	bj-cproj 34708	. 2 class (1o Proj 𝐴)
5	2, 4	wceq 1539	1 wff pr2 𝐴 = (1o Proj 𝐴)

This definition is referenced by:  bj-pr2eq  34734  bj-pr2un  34735  bj-pr2val  34736  bj-pr2ex  34738