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Theorem bj-inrab3 36912
Description: Generalization of dfrab3ss 4329, which it may shorten. (Contributed by BJ, 21-Apr-2019.) (Revised by OpenAI, 7-Jul-2020.)
Assertion
Ref Expression
bj-inrab3 (𝐴 ∩ {𝑥𝐵𝜑}) = ({𝑥𝐴𝜑} ∩ 𝐵)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵
Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem bj-inrab3
StepHypRef Expression
1 dfrab3 4325 . . 3 {𝑥𝐵𝜑} = (𝐵 ∩ {𝑥𝜑})
21ineq2i 4225 . 2 (𝐴 ∩ {𝑥𝐵𝜑}) = (𝐴 ∩ (𝐵 ∩ {𝑥𝜑}))
3 dfrab3 4325 . . . 4 {𝑥𝐴𝜑} = (𝐴 ∩ {𝑥𝜑})
43ineq2i 4225 . . 3 (𝐵 ∩ {𝑥𝐴𝜑}) = (𝐵 ∩ (𝐴 ∩ {𝑥𝜑}))
5 incom 4217 . . 3 ({𝑥𝐴𝜑} ∩ 𝐵) = (𝐵 ∩ {𝑥𝐴𝜑})
6 in12 4237 . . 3 (𝐴 ∩ (𝐵 ∩ {𝑥𝜑})) = (𝐵 ∩ (𝐴 ∩ {𝑥𝜑}))
74, 5, 63eqtr4i 2773 . 2 ({𝑥𝐴𝜑} ∩ 𝐵) = (𝐴 ∩ (𝐵 ∩ {𝑥𝜑}))
82, 7eqtr4i 2766 1 (𝐴 ∩ {𝑥𝐵𝜑}) = ({𝑥𝐴𝜑} ∩ 𝐵)
Colors of variables: wff setvar class
Syntax hints:   = wceq 1537  {cab 2712  {crab 3433  cin 3962
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-ext 2706
This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1540  df-ex 1777  df-sb 2063  df-clab 2713  df-cleq 2727  df-clel 2814  df-rab 3434  df-v 3480  df-in 3970
This theorem is referenced by: (None)
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