Theorem ssltex1 33908

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 33907	. 2 ⊢ (𝐴 <<s 𝐵 ↔ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ∧ (𝐴 ⊆ No ∧ 𝐵 ⊆ No ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝑥 <s 𝑦)))
2		simpll 763	. 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 395   ∧ w3a 1085   ∈ wcel 2108  ∀wral 3063  Vcvv 3422   ⊆ wss 3883   class class class wbr 5070   No csur 33770   <s cslt 33771   <<s csslt 33902

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pr 5347

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-br 5071  df-opab 5133  df-xp 5586  df-sslt 33903

This theorem is referenced by:  sssslt1  33916  sssslt2  33917  conway  33920  scutval  33921  sslttr  33928  ssltun1  33929  ssltun2  33930  etasslt  33934  etasslt2  33935  scutbdaybnd2lim  33938  slerec  33940  madecut  33992  coinitsslt  34016  cofcut1  34017  cofcutr  34019