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Theorem bj-rcleqf 36993
Description: Relative version of cleqf 2940. (Contributed by BJ, 27-Dec-2023.)
Hypotheses
Ref Expression
bj-rcleqf.a 𝑥𝐴
bj-rcleqf.b 𝑥𝐵
bj-rcleqf.v 𝑥𝑉
Assertion
Ref Expression
bj-rcleqf ((𝑉𝐴) = (𝑉𝐵) ↔ ∀𝑥𝑉 (𝑥𝐴𝑥𝐵))

Proof of Theorem bj-rcleqf
StepHypRef Expression
1 elin 3992 . . . . 5 (𝑥 ∈ (𝑉𝐴) ↔ (𝑥𝑉𝑥𝐴))
2 elin 3992 . . . . 5 (𝑥 ∈ (𝑉𝐵) ↔ (𝑥𝑉𝑥𝐵))
31, 2bibi12i 339 . . . 4 ((𝑥 ∈ (𝑉𝐴) ↔ 𝑥 ∈ (𝑉𝐵)) ↔ ((𝑥𝑉𝑥𝐴) ↔ (𝑥𝑉𝑥𝐵)))
4 pm5.32 573 . . . 4 ((𝑥𝑉 → (𝑥𝐴𝑥𝐵)) ↔ ((𝑥𝑉𝑥𝐴) ↔ (𝑥𝑉𝑥𝐵)))
53, 4bitr4i 278 . . 3 ((𝑥 ∈ (𝑉𝐴) ↔ 𝑥 ∈ (𝑉𝐵)) ↔ (𝑥𝑉 → (𝑥𝐴𝑥𝐵)))
65albii 1817 . 2 (∀𝑥(𝑥 ∈ (𝑉𝐴) ↔ 𝑥 ∈ (𝑉𝐵)) ↔ ∀𝑥(𝑥𝑉 → (𝑥𝐴𝑥𝐵)))
7 bj-rcleqf.v . . . 4 𝑥𝑉
8 bj-rcleqf.a . . . 4 𝑥𝐴
97, 8nfin 4245 . . 3 𝑥(𝑉𝐴)
10 bj-rcleqf.b . . . 4 𝑥𝐵
117, 10nfin 4245 . . 3 𝑥(𝑉𝐵)
129, 11cleqf 2940 . 2 ((𝑉𝐴) = (𝑉𝐵) ↔ ∀𝑥(𝑥 ∈ (𝑉𝐴) ↔ 𝑥 ∈ (𝑉𝐵)))
13 df-ral 3068 . 2 (∀𝑥𝑉 (𝑥𝐴𝑥𝐵) ↔ ∀𝑥(𝑥𝑉 → (𝑥𝐴𝑥𝐵)))
146, 12, 133bitr4i 303 1 ((𝑉𝐴) = (𝑉𝐵) ↔ ∀𝑥𝑉 (𝑥𝐴𝑥𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wal 1535   = wceq 1537  wcel 2108  wnfc 2893  wral 3067  cin 3975
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-11 2158  ax-12 2178  ax-ext 2711
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-tru 1540  df-ex 1778  df-nf 1782  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ral 3068  df-v 3490  df-in 3983
This theorem is referenced by:  bj-rcleq  36994  bj-reabeq  36995
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