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Theorem ssrab 4024
Description: Subclass of a restricted class abstraction. (Contributed by NM, 16-Aug-2006.)
Assertion
Ref Expression
ssrab (𝐵 ⊆ {𝑥𝐴𝜑} ↔ (𝐵𝐴 ∧ ∀𝑥𝐵 𝜑))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵
Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem ssrab
StepHypRef Expression
1 df-rab 3414 . . 3 {𝑥𝐴𝜑} = {𝑥 ∣ (𝑥𝐴𝜑)}
21sseq2i 3965 . 2 (𝐵 ⊆ {𝑥𝐴𝜑} ↔ 𝐵 ⊆ {𝑥 ∣ (𝑥𝐴𝜑)})
3 ssab 4016 . 2 (𝐵 ⊆ {𝑥 ∣ (𝑥𝐴𝜑)} ↔ ∀𝑥(𝑥𝐵 → (𝑥𝐴𝜑)))
4 dfss3 3925 . . . 4 (𝐵𝐴 ↔ ∀𝑥𝐵 𝑥𝐴)
54anbi1i 633 . . 3 ((𝐵𝐴 ∧ ∀𝑥𝐵 𝜑) ↔ (∀𝑥𝐵 𝑥𝐴 ∧ ∀𝑥𝐵 𝜑))
6 r19.26 3121 . . 3 (∀𝑥𝐵 (𝑥𝐴𝜑) ↔ (∀𝑥𝐵 𝑥𝐴 ∧ ∀𝑥𝐵 𝜑))
7 df-ral 3076 . . 3 (∀𝑥𝐵 (𝑥𝐴𝜑) ↔ ∀𝑥(𝑥𝐵 → (𝑥𝐴𝜑)))
85, 6, 73bitr2ri 302 . 2 (∀𝑥(𝑥𝐵 → (𝑥𝐴𝜑)) ↔ (𝐵𝐴 ∧ ∀𝑥𝐵 𝜑))
92, 3, 83bitri 299 1 (𝐵 ⊆ {𝑥𝐴𝜑} ↔ (𝐵𝐴 ∧ ∀𝑥𝐵 𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 399  wal 1557  wcel 2141  {cab 2739  wral 3075  {crab 3413  wss 3904
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-tru 1562  df-ex 1799  df-nf 1803  df-sb 2090  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3076  df-rab 3414  df-ss 3921
This theorem is referenced by:  ssrabdv  4026  omssnlim  7857  ordtypelem2  9464  ordtypelem10  9472  card2inf  9500  r0weon  9965  ramtlecl  17019  sscntz  19349  ppttop  23047  epttop  23049  cmpcov2  23430  tgcmp  23441  xkoinjcn  23727  fbssfi  23877  filssufilg  23951  uffixfr  23963  tmdgsum2  24136  symgtgp  24146  ghmcnp  24155  blcls  24546  clsocv  25292  lhop1lem  26055  ressatans  26976  axcontlem3  29113  axcontlem4  29114  ldgenpisyslem3  34423  ldgenpisys  34424  imambfm  34520  fineqvnttrclse  35384  lfuhgr  35432  connpconn  35549  cvmlift2lem11  35627  cvmlift2lem12  35628  bj-rabtr  37379  hbtlem6  43670  usgrexmpl1lem  48607  usgrexmpl2lem  48612
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