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Theorem bj-pr2ex 38148
Description: Sethood of the second projection. (Contributed by BJ, 6-Oct-2018.)
Assertion
Ref Expression
bj-pr2ex (𝐴 ∈ 𝑉 → pr2 𝐴 ∈ V)

Proof of Theorem bj-pr2ex
StepHypRef Expression
1 df-bj-pr2 38143 . 2 pr2 𝐴 = (1o Proj 𝐴)
2 bj-projex 38123 . 2 (𝐴 ∈ 𝑉 → (1o Proj 𝐴) ∈ V)
31, 2eqeltrid 2868 1 (𝐴 ∈ 𝑉 → pr2 𝐴 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2147  Vcvv 3454  1oc1o 8507   Proj bj-cproj 38118  pr2 bj-cpr2 38142
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 5238  ax-sep 5255  ax-pr 5398  ax-un 7783
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 4841  df-uni 4873  df-br 5109  df-opab 5174  df-xp 5664  df-rel 5665  df-cnv 5666  df-dm 5668  df-rn 5669  df-res 5670  df-ima 5671  df-bj-proj 38119  df-bj-pr2 38143
This theorem is used by:  bj-2uplex  38150
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