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Theorem rexeqbidv 2766
Description: Equality deduction for restricted universal quantifier. (Contributed by NM, 6-Nov-2007.)
Hypotheses
Ref Expression
raleqbidv.1 (𝜑 → 𝐴 = 𝐵)
raleqbidv.2 (𝜑 → (𝜓 ↔ 𝜒))
Assertion
Ref Expression
rexeqbidv (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜒))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝜑,𝑥
Allowed substitution hints:   𝜓(𝑥)   𝜒(𝑥)

Proof of Theorem rexeqbidv
StepHypRef Expression
1 raleqbidv.1 . . 3 (𝜑 → 𝐴 = 𝐵)
21rexeqdv 2756 . 2 (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜓))
3 raleqbidv.2 . . 3 (𝜑 → (𝜓 ↔ 𝜒))
43rexbidv 2551 . 2 (𝜑 → (∃𝑥 ∈ 𝐵 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜒))
52, 4bitrd 188 1 (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜒))
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ↔ wb 105   = wceq 1402  ∃wrex 2529
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-cleq 2231  df-clel 2234  df-nfc 2381  df-rex 2534
This theorem is used by:  supeq123d  7337  gzsumfzval  13769  gzsumval2  13772  ismnddef  13789  mndpropd  13811  mnd1  13820  isgrp  13869  isgrpd2e  13883  grp1  13969  issrgid  14391  isringid  14436  dvdsrvald  14508  rspsn  14979  1loopgrvd0fi  16769
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