Theorem brsslt 27831

Description: Binary relation form of the surreal set less-than relation. (Contributed by Scott Fenton, 8-Dec-2021.)

Assertion

Ref	Expression
brsslt	⊢ (𝐴 <<s 𝐵 ↔ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))

Distinct variable groups:   𝑥,𝐴,𝑦   𝑥,𝐵,𝑦

Proof of Theorem brsslt

Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-sslt 27827	. . 3 ⊢ <<s = {⟨𝑎, 𝑏⟩ ∣ (𝑎 ⊆ No ∧ 𝑏 ⊆ No ∧ ∀𝑥 ∈ 𝑎 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦)}
2	1	bropaex12 5776	. 2 ⊢ (𝐴 <<s 𝐵 → (𝐴 ∈ V ∧ 𝐵 ∈ V))
3		sseq1 4008	. . . 4 ⊢ (𝑎 = 𝐴 → (𝑎 ⊆ No ↔ 𝐴 ⊆ No ))
4		raleq 3322	. . . 4 ⊢ (𝑎 = 𝐴 → (∀𝑥 ∈ 𝑎 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦 ↔ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦))
5	3, 4	3anbi13d 1439	. . 3 ⊢ (𝑎 = 𝐴 → ((𝑎 ⊆ No ∧ 𝑏 ⊆ No ∧ ∀𝑥 ∈ 𝑎 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦) ↔ (𝐴 ⊆ No ∧ 𝑏 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦)))
6		sseq1 4008	. . . 4 ⊢ (𝑏 = 𝐵 → (𝑏 ⊆ No ↔ 𝐵 ⊆ No ))
7		raleq 3322	. . . . 5 ⊢ (𝑏 = 𝐵 → (∀𝑦 ∈ 𝑏 𝑥 <s 𝑦 ↔ ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦))
8	7	ralbidv 3177	. . . 4 ⊢ (𝑏 = 𝐵 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦 ↔ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦))
9	6, 8	3anbi23d 1440	. . 3 ⊢ (𝑏 = 𝐵 → ((𝐴 ⊆ No ∧ 𝑏 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝑏 𝑥 <s 𝑦) ↔ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))
10	5, 9, 1	brabg 5543	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 <<s 𝐵 ↔ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))
11	2, 10	biadanii 821	1 ⊢ (𝐴 <<s 𝐵 ↔ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))

Syntax hints:   ↔ wb 206   ∧ wa 395   ∧ w3a 1086   = wceq 1539   ∈ wcel 2107  ∀wral 3060  Vcvv 3479   ⊆ wss 3950   class class class wbr 5142   No csur 27685   <s cslt 27686   <<s csslt 27826

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2707  ax-sep 5295  ax-nul 5305  ax-pr 5431

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2714  df-cleq 2728  df-clel 2815  df-ral 3061  df-rex 3070  df-rab 3436  df-v 3481  df-dif 3953  df-un 3955  df-ss 3967  df-nul 4333  df-if 4525  df-sn 4626  df-pr 4628  df-op 4632  df-br 5143  df-opab 5205  df-xp 5690  df-sslt 27827

This theorem is referenced by:  ssltex1  27832  ssltex2  27833  ssltss1  27834  ssltss2  27835  ssltsep  27836  ssltd  27837  sssslt1  27841  sssslt2  27842  conway  27845  etasslt  27859  slerec  27865  cofcutr  27959