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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-bj-pr2 | Structured version Visualization version GIF version |
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 35300, bj-pr22val 35303, bj-pr2ex 35304. (Contributed by BJ, 6-Oct-2018.) (New usage is discouraged.) |
Ref | Expression |
---|---|
df-bj-pr2 | ⊢ pr2 𝐴 = (1o Proj 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cA | . . 3 class 𝐴 | |
2 | 1 | bj-cpr2 35298 | . 2 class pr2 𝐴 |
3 | c1o 8360 | . . 3 class 1o | |
4 | 3, 1 | bj-cproj 35274 | . 2 class (1o Proj 𝐴) |
5 | 2, 4 | wceq 1540 | 1 wff pr2 𝐴 = (1o Proj 𝐴) |
Colors of variables: wff setvar class |
This definition is referenced by: bj-pr2eq 35300 bj-pr2un 35301 bj-pr2val 35302 bj-pr2ex 35304 |
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