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Theorem rabeqel 35552
 Description: Class element of a restricted class abstraction. (Contributed by Peter Mazsa, 24-Jul-2021.)
Hypotheses
Ref Expression
rabeqel.1 𝐵 = {𝑥𝐴𝜑}
rabeqel.2 (𝑥 = 𝐶 → (𝜑𝜓))
Assertion
Ref Expression
rabeqel (𝐶𝐵 ↔ (𝜓𝐶𝐴))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐶   𝜓,𝑥
Allowed substitution hints:   𝜑(𝑥)   𝐵(𝑥)

Proof of Theorem rabeqel
StepHypRef Expression
1 rabeqel.2 . . 3 (𝑥 = 𝐶 → (𝜑𝜓))
2 rabeqel.1 . . 3 𝐵 = {𝑥𝐴𝜑}
31, 2elrab2 3663 . 2 (𝐶𝐵 ↔ (𝐶𝐴𝜓))
43biancomi 465 1 (𝐶𝐵 ↔ (𝜓𝐶𝐴))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1537   ∈ wcel 2114  {crab 3129 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-rab 3134  df-v 3475 This theorem is referenced by:  elrefrels2  35793  elrefrels3  35794  elcnvrefrels2  35806  elcnvrefrels3  35807  elsymrels2  35825  elsymrels3  35826  elsymrels4  35827  elsymrels5  35828  elrefsymrels2  35841  eltrrels2  35851  eltrrels3  35852  eleqvrels2  35863  eleqvrels3  35864  elfunsALTV  35961  eldisjs  35991
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