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Theorem bj-pr1ex 38097
Description: Sethood of the first projection. (Contributed by BJ, 6-Oct-2018.)
Assertion
Ref Expression
bj-pr1ex (𝐴 ∈ 𝑉 → pr1 𝐴 ∈ V)

Proof of Theorem bj-pr1ex
StepHypRef Expression
1 df-bj-pr1 38092 . 2 pr1 𝐴 = (∅ Proj 𝐴)
2 bj-projex 38086 . 2 (𝐴 ∈ 𝑉 → (∅ Proj 𝐴) ∈ V)
31, 2eqeltrid 2868 1 (𝐴 ∈ 𝑉 → pr1 𝐴 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2147  Vcvv 3454  ∅c0 4281   Proj bj-cproj 38081  pr1 bj-cpr1 38091
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5235  ax-sep 5252  ax-pr 5395  ax-un 7775
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-xp 5661  df-rel 5662  df-cnv 5663  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-bj-proj 38082  df-bj-pr1 38092
This theorem is used by:  bj-1uplex  38099  bj-2uplex  38113
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