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Theorem prdsbasex 17404
Description: Lemma for structure products. (Contributed by Mario Carneiro, 3-Jan-2015.)
Hypothesis
Ref Expression
prdsbasex.b 𝐵 = X𝑥 ∈ dom 𝑅(Base‘(𝑅𝑥))
Assertion
Ref Expression
prdsbasex 𝐵 ∈ V
Distinct variable group:   𝑥,𝑅
Allowed substitution hint:   𝐵(𝑥)

Proof of Theorem prdsbasex
StepHypRef Expression
1 prdsbasex.b . 2 𝐵 = X𝑥 ∈ dom 𝑅(Base‘(𝑅𝑥))
2 ixpexg 8863 . . 3 (∀𝑥 ∈ dom 𝑅(Base‘(𝑅𝑥)) ∈ V → X𝑥 ∈ dom 𝑅(Base‘(𝑅𝑥)) ∈ V)
3 fvexd 6849 . . 3 (𝑥 ∈ dom 𝑅 → (Base‘(𝑅𝑥)) ∈ V)
42, 3mprg 3058 . 2 X𝑥 ∈ dom 𝑅(Base‘(𝑅𝑥)) ∈ V
51, 4eqeltri 2833 1 𝐵 ∈ V
Colors of variables: wff setvar class
Syntax hints:   = wceq 1542  wcel 2114  Vcvv 3430  dom cdm 5624  cfv 6492  Xcixp 8838  Basecbs 17170
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5302  ax-pr 5370  ax-un 7682
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-iun 4936  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-fv 6500  df-ixp 8839
This theorem is referenced by: (None)
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