Theorem ssltex1 33975

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 33974	. 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 2110  ∀wral 3066  Vcvv 3431   ⊆ wss 3892   class class class wbr 5079   No csur 33837   <s cslt 33838   <<s csslt 33969

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-ext 2711  ax-sep 5227  ax-nul 5234  ax-pr 5356

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-sb 2072  df-clab 2718  df-cleq 2732  df-clel 2818  df-ral 3071  df-rex 3072  df-rab 3075  df-v 3433  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-nul 4263  df-if 4466  df-sn 4568  df-pr 4570  df-op 4574  df-br 5080  df-opab 5142  df-xp 5595  df-sslt 33970

This theorem is referenced by:  sssslt1  33983  sssslt2  33984  conway  33987  scutval  33988  sslttr  33995  ssltun1  33996  ssltun2  33997  etasslt  34001  etasslt2  34002  scutbdaybnd2lim  34005  slerec  34007  madecut  34059  coinitsslt  34083  cofcut1  34084  cofcutr  34086