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Theorem eqbrrdva 5880
Description: Deduction from extensionality principle for relations, given an equivalence only on the relation domain and range. (Contributed by Thierry Arnoux, 28-Nov-2017.)
Hypotheses
Ref Expression
eqbrrdva.1 (𝜑𝐴 ⊆ (𝐶 × 𝐷))
eqbrrdva.2 (𝜑𝐵 ⊆ (𝐶 × 𝐷))
eqbrrdva.3 ((𝜑𝑥𝐶𝑦𝐷) → (𝑥𝐴𝑦𝑥𝐵𝑦))
Assertion
Ref Expression
eqbrrdva (𝜑𝐴 = 𝐵)
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝜑,𝑥,𝑦
Allowed substitution hints:   𝐶(𝑥,𝑦)   𝐷(𝑥,𝑦)

Proof of Theorem eqbrrdva
StepHypRef Expression
1 eqbrrdva.1 . . . 4 (𝜑𝐴 ⊆ (𝐶 × 𝐷))
2 xpss 5701 . . . 4 (𝐶 × 𝐷) ⊆ (V × V)
31, 2sstrdi 3996 . . 3 (𝜑𝐴 ⊆ (V × V))
4 df-rel 5692 . . 3 (Rel 𝐴𝐴 ⊆ (V × V))
53, 4sylibr 234 . 2 (𝜑 → Rel 𝐴)
6 eqbrrdva.2 . . . 4 (𝜑𝐵 ⊆ (𝐶 × 𝐷))
76, 2sstrdi 3996 . . 3 (𝜑𝐵 ⊆ (V × V))
8 df-rel 5692 . . 3 (Rel 𝐵𝐵 ⊆ (V × V))
97, 8sylibr 234 . 2 (𝜑 → Rel 𝐵)
101ssbrd 5186 . . . 4 (𝜑 → (𝑥𝐴𝑦𝑥(𝐶 × 𝐷)𝑦))
11 brxp 5734 . . . 4 (𝑥(𝐶 × 𝐷)𝑦 ↔ (𝑥𝐶𝑦𝐷))
1210, 11imbitrdi 251 . . 3 (𝜑 → (𝑥𝐴𝑦 → (𝑥𝐶𝑦𝐷)))
136ssbrd 5186 . . . 4 (𝜑 → (𝑥𝐵𝑦𝑥(𝐶 × 𝐷)𝑦))
1413, 11imbitrdi 251 . . 3 (𝜑 → (𝑥𝐵𝑦 → (𝑥𝐶𝑦𝐷)))
15 eqbrrdva.3 . . . 4 ((𝜑𝑥𝐶𝑦𝐷) → (𝑥𝐴𝑦𝑥𝐵𝑦))
16153expib 1123 . . 3 (𝜑 → ((𝑥𝐶𝑦𝐷) → (𝑥𝐴𝑦𝑥𝐵𝑦)))
1712, 14, 16pm5.21ndd 379 . 2 (𝜑 → (𝑥𝐴𝑦𝑥𝐵𝑦))
185, 9, 17eqbrrdv 5803 1 (𝜑𝐴 = 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  w3a 1087   = wceq 1540  wcel 2108  Vcvv 3480  wss 3951   class class class wbr 5143   × cxp 5683  Rel wrel 5690
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2708  ax-sep 5296  ax-nul 5306  ax-pr 5432
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3482  df-dif 3954  df-un 3956  df-ss 3968  df-nul 4334  df-if 4526  df-sn 4627  df-pr 4629  df-op 4633  df-br 5144  df-opab 5206  df-xp 5691  df-rel 5692
This theorem is referenced by:  metustsym  24568
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