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Theorem abeqin 34360
 Description: Intersection with class abstraction. (Contributed by Peter Mazsa, 21-Jul-2021.)
Hypotheses
Ref Expression
abeqin.1 𝐴 = (𝐵𝐶)
abeqin.2 𝐵 = {𝑥𝜑}
Assertion
Ref Expression
abeqin 𝐴 = {𝑥𝐶𝜑}
Distinct variable group:   𝑥,𝐶
Allowed substitution hints:   𝜑(𝑥)   𝐴(𝑥)   𝐵(𝑥)

Proof of Theorem abeqin
StepHypRef Expression
1 abeqin.2 . . 3 𝐵 = {𝑥𝜑}
21ineq1i 3961 . 2 (𝐵𝐶) = ({𝑥𝜑} ∩ 𝐶)
3 abeqin.1 . 2 𝐴 = (𝐵𝐶)
4 dfrab2 4051 . 2 {𝑥𝐶𝜑} = ({𝑥𝜑} ∩ 𝐶)
52, 3, 43eqtr4i 2803 1 𝐴 = {𝑥𝐶𝜑}
 Colors of variables: wff setvar class Syntax hints:   = wceq 1631  {cab 2757  {crab 3065   ∩ cin 3722 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 837  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-rab 3070  df-v 3353  df-in 3730 This theorem is referenced by:  abeqinbi  34361  dfcnvrefrels3  34619
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