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Theorem bj-rcleqf 38129
Description: Relative version of cleqf 2954. (Contributed by BJ, 27-Dec-2023.)
Hypotheses
Ref Expression
bj-rcleqf.a Ⅎ𝑥𝐴
bj-rcleqf.b Ⅎ𝑥𝐵
bj-rcleqf.v Ⅎ𝑥𝑉
Assertion
Ref Expression
bj-rcleqf ((𝑉 ∩ 𝐴) = (𝑉 ∩ 𝐵) ↔ ∀𝑥 ∈ 𝑉 (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))

Proof of Theorem bj-rcleqf
StepHypRef Expression
1 elin 4096 . . . . 5 (𝑥 ∈ (𝑉 ∩ 𝐴) ↔ (𝑥 ∈ 𝑉 ∧ 𝑥 ∈ 𝐴))
2 elin 4096 . . . . 5 (𝑥 ∈ (𝑉 ∩ 𝐵) ↔ (𝑥 ∈ 𝑉 ∧ 𝑥 ∈ 𝐵))
31, 2bibi12i 342 . . . 4 ((𝑥 ∈ (𝑉 ∩ 𝐴) ↔ 𝑥 ∈ (𝑉 ∩ 𝐵)) ↔ ((𝑥 ∈ 𝑉 ∧ 𝑥 ∈ 𝐴) ↔ (𝑥 ∈ 𝑉 ∧ 𝑥 ∈ 𝐵)))
4 pm5.32 584 . . . 4 ((𝑥 ∈ 𝑉 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) ↔ ((𝑥 ∈ 𝑉 ∧ 𝑥 ∈ 𝐴) ↔ (𝑥 ∈ 𝑉 ∧ 𝑥 ∈ 𝐵)))
53, 4bitr4i 281 . . 3 ((𝑥 ∈ (𝑉 ∩ 𝐴) ↔ 𝑥 ∈ (𝑉 ∩ 𝐵)) ↔ (𝑥 ∈ 𝑉 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)))
65albii 1852 . 2 (∀𝑥(𝑥 ∈ (𝑉 ∩ 𝐴) ↔ 𝑥 ∈ (𝑉 ∩ 𝐵)) ↔ ∀𝑥(𝑥 ∈ 𝑉 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)))
7 bj-rcleqf.v . . . 4 Ⅎ𝑥𝑉
8 bj-rcleqf.a . . . 4 Ⅎ𝑥𝐴
97, 8nfin 4124 . . 3 Ⅎ𝑥(𝑉 ∩ 𝐴)
10 bj-rcleqf.b . . . 4 Ⅎ𝑥𝐵
117, 10nfin 4124 . . 3 Ⅎ𝑥(𝑉 ∩ 𝐵)
129, 11cleqf 2954 . 2 ((𝑉 ∩ 𝐴) = (𝑉 ∩ 𝐵) ↔ ∀𝑥(𝑥 ∈ (𝑉 ∩ 𝐴) ↔ 𝑥 ∈ (𝑉 ∩ 𝐵)))
13 df-ral 3081 . 2 (∀𝑥 ∈ 𝑉 (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) ↔ ∀𝑥(𝑥 ∈ 𝑉 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)))
146, 12, 133bitr4i 306 1 ((𝑉 ∩ 𝐴) = (𝑉 ∩ 𝐵) ↔ ∀𝑥 ∈ 𝑉 (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401  ∀wal 1568   = wceq 1570   ∈ wcel 2147  Ⅎwnfc 2911  ∀wral 3080   ∩ cin 4092
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-11 2197  ax-12 2216  ax-ext 2735
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-tru 1573  df-ex 1813  df-nf 1817  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-v 3456  df-in 4094
This theorem is used by:  bj-rcleq  38130  bj-reabeq  38131
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