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Theorem rabssf 42668
Description: Restricted class abstraction in a subclass relationship. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
Hypothesis
Ref Expression
rabssf.1 𝑥𝐵
Assertion
Ref Expression
rabssf ({𝑥𝐴𝜑} ⊆ 𝐵 ↔ ∀𝑥𝐴 (𝜑𝑥𝐵))

Proof of Theorem rabssf
StepHypRef Expression
1 df-rab 3073 . . 3 {𝑥𝐴𝜑} = {𝑥 ∣ (𝑥𝐴𝜑)}
21sseq1i 3949 . 2 ({𝑥𝐴𝜑} ⊆ 𝐵 ↔ {𝑥 ∣ (𝑥𝐴𝜑)} ⊆ 𝐵)
3 rabssf.1 . . 3 𝑥𝐵
43abssf 42662 . 2 ({𝑥 ∣ (𝑥𝐴𝜑)} ⊆ 𝐵 ↔ ∀𝑥((𝑥𝐴𝜑) → 𝑥𝐵))
5 impexp 451 . . . 4 (((𝑥𝐴𝜑) → 𝑥𝐵) ↔ (𝑥𝐴 → (𝜑𝑥𝐵)))
65albii 1822 . . 3 (∀𝑥((𝑥𝐴𝜑) → 𝑥𝐵) ↔ ∀𝑥(𝑥𝐴 → (𝜑𝑥𝐵)))
7 df-ral 3069 . . 3 (∀𝑥𝐴 (𝜑𝑥𝐵) ↔ ∀𝑥(𝑥𝐴 → (𝜑𝑥𝐵)))
86, 7bitr4i 277 . 2 (∀𝑥((𝑥𝐴𝜑) → 𝑥𝐵) ↔ ∀𝑥𝐴 (𝜑𝑥𝐵))
92, 4, 83bitri 297 1 ({𝑥𝐴𝜑} ⊆ 𝐵 ↔ ∀𝑥𝐴 (𝜑𝑥𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396  wal 1537  wcel 2106  {cab 2715  wnfc 2887  wral 3064  {crab 3068  wss 3887
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-tru 1542  df-ex 1783  df-nf 1787  df-sb 2068  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ral 3069  df-rab 3073  df-v 3434  df-in 3894  df-ss 3904
This theorem is referenced by:  rabssd  42691  supminfxr2  43009  preimageiingt  44257  preimaleiinlt  44258  smfmullem4  44328
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