Definition df-bj-pr2 33003

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 33004, bj-pr22val 33007, bj-pr2ex 33008. (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 33002	. 2 class pr2 𝐴
3		c1o 7553	. . 3 class 1𝑜
4	3, 1	bj-cproj 32978	. 2 class (1𝑜 Proj 𝐴)
5	2, 4	wceq 1483	1 wff pr2 𝐴 = (1𝑜 Proj 𝐴)

This definition is referenced by:  bj-pr2eq  33004  bj-pr2un  33005  bj-pr2val  33006  bj-pr2ex  33008