Theorem ssltex1 33981

Description: The first argument of surreal set less than exists. (Contributed by Scott Fenton, 8-Dec-2021.)

Assertion

Ref	Expression
ssltex1	⊢ (𝐴 <<s 𝐵 → 𝐴 ∈ V)

Proof of Theorem ssltex1

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

Step	Hyp	Ref	Expression
1		brsslt 33980	. 2 ⊢ (𝐴 <<s 𝐵 ↔ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))
2		simpll 764	. 2 ⊢ (((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)) → 𝐴 ∈ V)
3	1, 2	sylbi 216	1 ⊢ (𝐴 <<s 𝐵 → 𝐴 ∈ V)

Syntax hints:   → wi 4   ∧ wa 396   ∧ w3a 1086   ∈ wcel 2106  ∀wral 3064  Vcvv 3432   ⊆ wss 3887   class class class wbr 5074   No csur 33843   <s cslt 33844   <<s csslt 33975

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pr 5352

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-sb 2068  df-clab 2716  df-cleq 2730  df-clel 2816  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-br 5075  df-opab 5137  df-xp 5595  df-sslt 33976

This theorem is referenced by:  sssslt1  33989  sssslt2  33990  conway  33993  scutval  33994  sslttr  34001  ssltun1  34002  ssltun2  34003  etasslt  34007  etasslt2  34008  scutbdaybnd2lim  34011  slerec  34013  madecut  34065  coinitsslt  34089  cofcut1  34090  cofcutr  34092