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Definition df-bj-pr1 34432
Description: Definition of the first projection of a class tuple. New usage is discouraged because the precise definition is generally unimportant compared to the characteristic properties bj-pr1eq 34433, bj-pr11val 34436, bj-pr21val 34444, bj-pr1ex 34437. (Contributed by BJ, 6-Apr-2019.) (New usage is discouraged.)
Assertion
Ref Expression
df-bj-pr1 pr1 𝐴 = (∅ Proj 𝐴)

Detailed syntax breakdown of Definition df-bj-pr1
StepHypRef Expression
1 cA . . 3 class 𝐴
21bj-cpr1 34431 . 2 class pr1 𝐴
3 c0 4246 . . 3 class
43, 1bj-cproj 34421 . 2 class (∅ Proj 𝐴)
52, 4wceq 1538 1 wff pr1 𝐴 = (∅ Proj 𝐴)
Colors of variables: wff setvar class
This definition is referenced by:  bj-pr1eq  34433  bj-pr1un  34434  bj-pr1val  34435  bj-pr1ex  34437
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