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Theorem bj-pr1ex 34321
Description: Sethood of the first projection. (Contributed by BJ, 6-Oct-2018.)
Assertion
Ref Expression
bj-pr1ex (𝐴𝑉 → pr1 𝐴 ∈ V)

Proof of Theorem bj-pr1ex
StepHypRef Expression
1 df-bj-pr1 34316 . 2 pr1 𝐴 = (∅ Proj 𝐴)
2 bj-projex 34310 . 2 (𝐴𝑉 → (∅ Proj 𝐴) ∈ V)
31, 2eqeltrid 2917 1 (𝐴𝑉 → pr1 𝐴 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2114  Vcvv 3494  c0 4291   Proj bj-cproj 34305  pr1 bj-cpr1 34315
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pr 5330  ax-un 7461
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-fal 1550  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-opab 5129  df-xp 5561  df-cnv 5563  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-bj-proj 34306  df-bj-pr1 34316
This theorem is referenced by:  bj-1uplex  34323  bj-2uplex  34337
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