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Theorem ss2rab 4000
Description: Restricted abstraction classes in a subclass relationship. (Contributed by NM, 30-May-1999.)
Assertion
Ref Expression
ss2rab ({𝑥𝐴𝜑} ⊆ {𝑥𝐴𝜓} ↔ ∀𝑥𝐴 (𝜑𝜓))

Proof of Theorem ss2rab
StepHypRef Expression
1 df-rab 3072 . . 3 {𝑥𝐴𝜑} = {𝑥 ∣ (𝑥𝐴𝜑)}
2 df-rab 3072 . . 3 {𝑥𝐴𝜓} = {𝑥 ∣ (𝑥𝐴𝜓)}
31, 2sseq12i 3947 . 2 ({𝑥𝐴𝜑} ⊆ {𝑥𝐴𝜓} ↔ {𝑥 ∣ (𝑥𝐴𝜑)} ⊆ {𝑥 ∣ (𝑥𝐴𝜓)})
4 ss2ab 3989 . 2 ({𝑥 ∣ (𝑥𝐴𝜑)} ⊆ {𝑥 ∣ (𝑥𝐴𝜓)} ↔ ∀𝑥((𝑥𝐴𝜑) → (𝑥𝐴𝜓)))
5 df-ral 3068 . . 3 (∀𝑥𝐴 (𝜑𝜓) ↔ ∀𝑥(𝑥𝐴 → (𝜑𝜓)))
6 imdistan 567 . . . 4 ((𝑥𝐴 → (𝜑𝜓)) ↔ ((𝑥𝐴𝜑) → (𝑥𝐴𝜓)))
76albii 1823 . . 3 (∀𝑥(𝑥𝐴 → (𝜑𝜓)) ↔ ∀𝑥((𝑥𝐴𝜑) → (𝑥𝐴𝜓)))
85, 7bitr2i 275 . 2 (∀𝑥((𝑥𝐴𝜑) → (𝑥𝐴𝜓)) ↔ ∀𝑥𝐴 (𝜑𝜓))
93, 4, 83bitri 296 1 ({𝑥𝐴𝜑} ⊆ {𝑥𝐴𝜓} ↔ ∀𝑥𝐴 (𝜑𝜓))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wal 1537  wcel 2108  {cab 2715  wral 3063  {crab 3067  wss 3883
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-tru 1542  df-ex 1784  df-nf 1788  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ral 3068  df-rab 3072  df-v 3424  df-in 3890  df-ss 3900
This theorem is referenced by:  ss2rabdv  4005  ss2rabi  4006  mptexgf  7080  scottex  9574  ondomon  10250  eltsms  23192  xrlimcnp  26023  wwlksnfi  28172  disjxwwlkn  28179  occon  29550  spanss  29611  chpssati  30626  lpssat  36954  lssatle  36956  lssat  36957  atlatle  37261  pmaple  37702  diaord  38988  mapdordlem2  39578  rmxyelqirr  40648  itgoss  40904  ovnsslelem  43988  ovolval5lem3  44082  pimiooltgt  44135  preimageiingt  44144  preimaleiinlt  44145
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