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Theorem rababg 43004
Description: Condition when restricted class is equal to unrestricted class. (Contributed by RP, 13-Aug-2020.)
Assertion
Ref Expression
rababg (∀𝑥(𝜑𝑥𝐴) ↔ {𝑥𝐴𝜑} = {𝑥𝜑})

Proof of Theorem rababg
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 ancrb 547 . . 3 ((𝜑𝑥𝐴) ↔ (𝜑 → (𝑥𝐴𝜑)))
21albii 1814 . 2 (∀𝑥(𝜑𝑥𝐴) ↔ ∀𝑥(𝜑 → (𝑥𝐴𝜑)))
3 nfv 1910 . . 3 𝑦(𝜑 → (𝑥𝐴𝜑))
4 nfsab1 2713 . . . 4 𝑥 𝑦 ∈ {𝑥𝜑}
5 nfrab1 3448 . . . . 5 𝑥{𝑥𝐴𝜑}
65nfcri 2886 . . . 4 𝑥 𝑦 ∈ {𝑥𝐴𝜑}
74, 6nfim 1892 . . 3 𝑥(𝑦 ∈ {𝑥𝜑} → 𝑦 ∈ {𝑥𝐴𝜑})
8 abid 2709 . . . . 5 (𝑥 ∈ {𝑥𝜑} ↔ 𝜑)
9 eleq1w 2812 . . . . 5 (𝑥 = 𝑦 → (𝑥 ∈ {𝑥𝜑} ↔ 𝑦 ∈ {𝑥𝜑}))
108, 9bitr3id 285 . . . 4 (𝑥 = 𝑦 → (𝜑𝑦 ∈ {𝑥𝜑}))
11 rabid 3449 . . . . 5 (𝑥 ∈ {𝑥𝐴𝜑} ↔ (𝑥𝐴𝜑))
12 eleq1w 2812 . . . . 5 (𝑥 = 𝑦 → (𝑥 ∈ {𝑥𝐴𝜑} ↔ 𝑦 ∈ {𝑥𝐴𝜑}))
1311, 12bitr3id 285 . . . 4 (𝑥 = 𝑦 → ((𝑥𝐴𝜑) ↔ 𝑦 ∈ {𝑥𝐴𝜑}))
1410, 13imbi12d 344 . . 3 (𝑥 = 𝑦 → ((𝜑 → (𝑥𝐴𝜑)) ↔ (𝑦 ∈ {𝑥𝜑} → 𝑦 ∈ {𝑥𝐴𝜑})))
153, 7, 14cbvalv1 2333 . 2 (∀𝑥(𝜑 → (𝑥𝐴𝜑)) ↔ ∀𝑦(𝑦 ∈ {𝑥𝜑} → 𝑦 ∈ {𝑥𝐴𝜑}))
16 eqss 3995 . . 3 ({𝑥𝐴𝜑} = {𝑥𝜑} ↔ ({𝑥𝐴𝜑} ⊆ {𝑥𝜑} ∧ {𝑥𝜑} ⊆ {𝑥𝐴𝜑}))
17 rabssab 4081 . . . 4 {𝑥𝐴𝜑} ⊆ {𝑥𝜑}
1817biantrur 530 . . 3 ({𝑥𝜑} ⊆ {𝑥𝐴𝜑} ↔ ({𝑥𝐴𝜑} ⊆ {𝑥𝜑} ∧ {𝑥𝜑} ⊆ {𝑥𝐴𝜑}))
19 dfss2 3967 . . 3 ({𝑥𝜑} ⊆ {𝑥𝐴𝜑} ↔ ∀𝑦(𝑦 ∈ {𝑥𝜑} → 𝑦 ∈ {𝑥𝐴𝜑}))
2016, 18, 193bitr2ri 300 . 2 (∀𝑦(𝑦 ∈ {𝑥𝜑} → 𝑦 ∈ {𝑥𝐴𝜑}) ↔ {𝑥𝐴𝜑} = {𝑥𝜑})
212, 15, 203bitri 297 1 (∀𝑥(𝜑𝑥𝐴) ↔ {𝑥𝐴𝜑} = {𝑥𝜑})
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wal 1532   = wceq 1534  wcel 2099  {cab 2705  {crab 3429  wss 3947
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-tru 1537  df-ex 1775  df-nf 1779  df-sb 2061  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-rab 3430  df-v 3473  df-in 3954  df-ss 3964
This theorem is referenced by: (None)
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