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Theorem sbthcl 9027
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 8888 . 2 Rel ≈
2 inss1 4189 . . 3 ( ≼ ∩ ≼ ) ⊆ ≼
3 reldom 8889 . . 3 Rel ≼
4 relss 5731 . . 3 (( ≼ ∩ ≼ ) ⊆ ≼ → (Rel ≼ → Rel ( ≼ ∩ ≼ )))
52, 3, 4mp2 9 . 2 Rel ( ≼ ∩ ≼ )
6 brin 5150 . . 3 (𝑥( ≼ ∩ ≼ )𝑦 ↔ (𝑥𝑦𝑥𝑦))
7 vex 3444 . . . . 5 𝑥 ∈ V
8 vex 3444 . . . . 5 𝑦 ∈ V
97, 8brcnv 5831 . . . 4 (𝑥𝑦𝑦𝑥)
109anbi2i 623 . . 3 ((𝑥𝑦𝑥𝑦) ↔ (𝑥𝑦𝑦𝑥))
11 sbthb 9026 . . 3 ((𝑥𝑦𝑦𝑥) ↔ 𝑥𝑦)
126, 10, 113bitrri 298 . 2 (𝑥𝑦𝑥( ≼ ∩ ≼ )𝑦)
131, 5, 12eqbrriv 5740 1 ≈ = ( ≼ ∩ ≼ )
Colors of variables: wff setvar class
Syntax hints:  wa 395   = wceq 1541  cin 3900  wss 3901   class class class wbr 5098  ccnv 5623  Rel wrel 5629  cen 8880  cdom 8881
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2184  ax-ext 2708  ax-sep 5241  ax-nul 5251  ax-pow 5310  ax-pr 5377  ax-un 7680
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ral 3052  df-rex 3061  df-rab 3400  df-v 3442  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4581  df-pr 4583  df-op 4587  df-uni 4864  df-br 5099  df-opab 5161  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-fun 6494  df-fn 6495  df-f 6496  df-f1 6497  df-fo 6498  df-f1o 6499  df-er 8635  df-en 8884  df-dom 8885
This theorem is referenced by:  dfsdom2  9028
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