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Theorem rabssf 41248
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 3151 . . 3 {𝑥𝐴𝜑} = {𝑥 ∣ (𝑥𝐴𝜑)}
21sseq1i 3998 . 2 ({𝑥𝐴𝜑} ⊆ 𝐵 ↔ {𝑥 ∣ (𝑥𝐴𝜑)} ⊆ 𝐵)
3 rabssf.1 . . 3 𝑥𝐵
43abssf 41241 . 2 ({𝑥 ∣ (𝑥𝐴𝜑)} ⊆ 𝐵 ↔ ∀𝑥((𝑥𝐴𝜑) → 𝑥𝐵))
5 impexp 451 . . . 4 (((𝑥𝐴𝜑) → 𝑥𝐵) ↔ (𝑥𝐴 → (𝜑𝑥𝐵)))
65albii 1813 . . 3 (∀𝑥((𝑥𝐴𝜑) → 𝑥𝐵) ↔ ∀𝑥(𝑥𝐴 → (𝜑𝑥𝐵)))
7 df-ral 3147 . . 3 (∀𝑥𝐴 (𝜑𝑥𝐵) ↔ ∀𝑥(𝑥𝐴 → (𝜑𝑥𝐵)))
86, 7bitr4i 279 . 2 (∀𝑥((𝑥𝐴𝜑) → 𝑥𝐵) ↔ ∀𝑥𝐴 (𝜑𝑥𝐵))
92, 4, 83bitri 298 1 ({𝑥𝐴𝜑} ⊆ 𝐵 ↔ ∀𝑥𝐴 (𝜑𝑥𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396  wal 1528  wcel 2106  {cab 2802  wnfc 2965  wral 3142  {crab 3146  wss 3939
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2152  ax-12 2167  ax-ext 2796
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-clab 2803  df-cleq 2817  df-clel 2897  df-nfc 2967  df-ral 3147  df-rab 3151  df-in 3946  df-ss 3955
This theorem is referenced by:  rabssd  41273  supminfxr2  41607  preimageiingt  42861  preimaleiinlt  42862  smfmullem4  42932
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