Theorem ssltss2 33670

Description: The second argument of surreal set is a set of surreals. (Contributed by Scott Fenton, 8-Dec-2021.)

Assertion

Ref	Expression
ssltss2	⊢ (𝐴 <<s 𝐵 → 𝐵 ⊆ No )

Proof of Theorem ssltss2

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		brsslt 33666	. 2 ⊢ (𝐴 <<s 𝐵 ↔ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))
2		simpr2 1197	. 2 ⊢ (((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)) → 𝐵 ⊆ No )
3	1, 2	sylbi 220	1 ⊢ (𝐴 <<s 𝐵 → 𝐵 ⊆ No )

Syntax hints:   → wi 4   ∧ wa 399   ∧ w3a 1089   ∈ wcel 2112  ∀wral 3051  Vcvv 3398   ⊆ wss 3853   class class class wbr 5039   No csur 33529   <s cslt 33530   <<s csslt 33661

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2018  ax-8 2114  ax-9 2122  ax-ext 2708  ax-sep 5177  ax-nul 5184  ax-pr 5307

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-sb 2073  df-clab 2715  df-cleq 2728  df-clel 2809  df-ral 3056  df-rex 3057  df-rab 3060  df-v 3400  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4224  df-if 4426  df-sn 4528  df-pr 4530  df-op 4534  df-br 5040  df-opab 5102  df-xp 5542  df-sslt 33662

This theorem is referenced by:  sssslt1  33675  sssslt2  33676  conway  33679  sslttr  33687  ssltun1  33688  ssltun2  33689  etasslt  33693  slerec  33699  sltrec  33700  cofsslt  33774  coinitsslt  33775  cofcut1  33776  cofcutr  33778