Theorem sbthcl 8639

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.

Step	Hyp	Ref	Expression
1		relen 8514	. 2 ⊢ Rel ≈
2		inss1 4205	. . 3 ⊢ ( ≼ ∩ ◡ ≼ ) ⊆ ≼
3		reldom 8515	. . 3 ⊢ Rel ≼
4		relss 5656	. . 3 ⊢ (( ≼ ∩ ◡ ≼ ) ⊆ ≼ → (Rel ≼ → Rel ( ≼ ∩ ◡ ≼ )))
5	2, 3, 4	mp2 9	. 2 ⊢ Rel ( ≼ ∩ ◡ ≼ )
6		brin 5118	. . 3 ⊢ (𝑥( ≼ ∩ ◡ ≼ )𝑦 ↔ (𝑥 ≼ 𝑦 ∧ 𝑥◡ ≼ 𝑦))
7		vex 3497	. . . . 5 ⊢ 𝑥 ∈ V
8		vex 3497	. . . . 5 ⊢ 𝑦 ∈ V
9	7, 8	brcnv 5753	. . . 4 ⊢ (𝑥◡ ≼ 𝑦 ↔ 𝑦 ≼ 𝑥)
10	9	anbi2i 624	. . 3 ⊢ ((𝑥 ≼ 𝑦 ∧ 𝑥◡ ≼ 𝑦) ↔ (𝑥 ≼ 𝑦 ∧ 𝑦 ≼ 𝑥))
11		sbthb 8638	. . 3 ⊢ ((𝑥 ≼ 𝑦 ∧ 𝑦 ≼ 𝑥) ↔ 𝑥 ≈ 𝑦)
12	6, 10, 11	3bitrri 300	. 2 ⊢ (𝑥 ≈ 𝑦 ↔ 𝑥( ≼ ∩ ◡ ≼ )𝑦)
13	1, 5, 12	eqbrriv 5664	1 ⊢ ≈ = ( ≼ ∩ ◡ ≼ )

Syntax hints:   ∧ wa 398   = wceq 1537   ∩ cin 3935   ⊆ wss 3936   class class class wbr 5066  ^◡ccnv 5554  Rel wrel 5560   ≈ cen 8506   ≼ cdom 8507

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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-opab 5129  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-er 8289  df-en 8510  df-dom 8511

This theorem is referenced by:  dfsdom2  8640