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Theorem sbthcl 8435
Description: Schroeder-Bernstein Theorem in class form. (Contributed by NM, 28-Mar-1998.)
Assertion
Ref Expression
sbthcl ≈ = ( ≼ ∩ ≼ )

Proof of Theorem sbthcl
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relen 8311 . 2 Rel ≈
2 inss1 4092 . . 3 ( ≼ ∩ ≼ ) ⊆ ≼
3 reldom 8312 . . 3 Rel ≼
4 relss 5506 . . 3 (( ≼ ∩ ≼ ) ⊆ ≼ → (Rel ≼ → Rel ( ≼ ∩ ≼ )))
52, 3, 4mp2 9 . 2 Rel ( ≼ ∩ ≼ )
6 brin 4981 . . 3 (𝑥( ≼ ∩ ≼ )𝑦 ↔ (𝑥𝑦𝑥𝑦))
7 vex 3418 . . . . 5 𝑥 ∈ V
8 vex 3418 . . . . 5 𝑦 ∈ V
97, 8brcnv 5603 . . . 4 (𝑥𝑦𝑦𝑥)
109anbi2i 613 . . 3 ((𝑥𝑦𝑥𝑦) ↔ (𝑥𝑦𝑦𝑥))
11 sbthb 8434 . . 3 ((𝑥𝑦𝑦𝑥) ↔ 𝑥𝑦)
126, 10, 113bitrri 290 . 2 (𝑥𝑦𝑥( ≼ ∩ ≼ )𝑦)
131, 5, 12eqbrriv 5514 1 ≈ = ( ≼ ∩ ≼ )
Colors of variables: wff setvar class
Syntax hints:  wa 387   = wceq 1507  cin 3828  wss 3829   class class class wbr 4929  ccnv 5406  Rel wrel 5412  cen 8303  cdom 8304
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1758  ax-4 1772  ax-5 1869  ax-6 1928  ax-7 1965  ax-8 2052  ax-9 2059  ax-10 2079  ax-11 2093  ax-12 2106  ax-13 2301  ax-ext 2750  ax-sep 5060  ax-nul 5067  ax-pow 5119  ax-pr 5186  ax-un 7279
This theorem depends on definitions:  df-bi 199  df-an 388  df-or 834  df-3an 1070  df-tru 1510  df-ex 1743  df-nf 1747  df-sb 2016  df-mo 2547  df-eu 2584  df-clab 2759  df-cleq 2771  df-clel 2846  df-nfc 2918  df-ral 3093  df-rex 3094  df-rab 3097  df-v 3417  df-dif 3832  df-un 3834  df-in 3836  df-ss 3843  df-nul 4179  df-if 4351  df-pw 4424  df-sn 4442  df-pr 4444  df-op 4448  df-uni 4713  df-br 4930  df-opab 4992  df-id 5312  df-xp 5413  df-rel 5414  df-cnv 5415  df-co 5416  df-dm 5417  df-rn 5418  df-res 5419  df-ima 5420  df-fun 6190  df-fn 6191  df-f 6192  df-f1 6193  df-fo 6194  df-f1o 6195  df-er 8089  df-en 8307  df-dom 8308
This theorem is referenced by:  dfsdom2  8436
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