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Theorem bj-pr1ex 37670
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 37665 . 2 pr1 𝐴 = (∅ Proj 𝐴)
2 bj-projex 37659 . 2 (𝐴𝑉 → (∅ Proj 𝐴) ∈ V)
31, 2eqeltrid 2866 1 (𝐴𝑉 → pr1 𝐴 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wcel 2142  Vcvv 3454  c0 4285   Proj bj-cproj 37654  pr1 bj-cpr1 37664
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1824  ax-4 1838  ax-5 1939  ax-6 1996  ax-7 2037  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-rep 5237  ax-sep 5256  ax-pr 5403  ax-un 7734
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1104  df-tru 1572  df-fal 1582  df-ex 1809  df-nf 1813  df-sb 2096  df-mo 2566  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ral 3079  df-rex 3089  df-rab 3416  df-v 3456  df-sbc 3744  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4487  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-br 5109  df-opab 5173  df-xp 5666  df-cnv 5668  df-dm 5670  df-rn 5671  df-res 5672  df-ima 5673  df-bj-proj 37655  df-bj-pr1 37665
This theorem is used by:  bj-1uplex  37672  bj-2uplex  37686
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