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Theorem nla0002 43414
Description: Extending a linear order to subsets, the empty set is less than any subset. Note in [Alling], p. 3. (Contributed by RP, 28-Nov-2023.)
Hypotheses
Ref Expression
nla0001.defsslt < = {⟨𝑎, 𝑏⟩ ∣ (𝑎𝑆𝑏𝑆 ∧ ∀𝑥𝑎𝑦𝑏 𝑥𝑅𝑦)}
nla0001.set (𝜑𝐴 ∈ V)
nla0002.sset (𝜑𝐴𝑆)
Assertion
Ref Expression
nla0002 (𝜑 → ∅ < 𝐴)
Distinct variable groups:   𝐴,𝑎,𝑏,𝑥,𝑦   𝑅,𝑎,𝑏   𝑆,𝑎,𝑏
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑎,𝑏)   𝑅(𝑥,𝑦)   𝑆(𝑥,𝑦)   < (𝑥,𝑦,𝑎,𝑏)

Proof of Theorem nla0002
StepHypRef Expression
1 0ex 5313 . . 3 ∅ ∈ V
21a1i 11 . 2 (𝜑 → ∅ ∈ V)
3 nla0001.set . 2 (𝜑𝐴 ∈ V)
4 0ss 4406 . . . 4 ∅ ⊆ 𝑆
54a1i 11 . . 3 (𝜑 → ∅ ⊆ 𝑆)
6 nla0002.sset . . 3 (𝜑𝐴𝑆)
7 ral0 4519 . . . 4 𝑥 ∈ ∅ ∀𝑦𝐴 𝑥𝑅𝑦
87a1i 11 . . 3 (𝜑 → ∀𝑥 ∈ ∅ ∀𝑦𝐴 𝑥𝑅𝑦)
95, 6, 83jca 1127 . 2 (𝜑 → (∅ ⊆ 𝑆𝐴𝑆 ∧ ∀𝑥 ∈ ∅ ∀𝑦𝐴 𝑥𝑅𝑦))
10 nla0001.defsslt . . 3 < = {⟨𝑎, 𝑏⟩ ∣ (𝑎𝑆𝑏𝑆 ∧ ∀𝑥𝑎𝑦𝑏 𝑥𝑅𝑦)}
1110rp-brsslt 43413 . 2 (∅ < 𝐴 ↔ ((∅ ∈ V ∧ 𝐴 ∈ V) ∧ (∅ ⊆ 𝑆𝐴𝑆 ∧ ∀𝑥 ∈ ∅ ∀𝑦𝐴 𝑥𝑅𝑦)))
122, 3, 9, 11syl21anbrc 1343 1 (𝜑 → ∅ < 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1086   = wceq 1537  wcel 2106  wral 3059  Vcvv 3478  wss 3963  c0 4339   class class class wbr 5148  {copab 5210
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-sb 2063  df-clab 2713  df-cleq 2727  df-clel 2814  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-dif 3966  df-un 3968  df-ss 3980  df-nul 4340  df-if 4532  df-sn 4632  df-pr 4634  df-op 4638  df-br 5149  df-opab 5211  df-xp 5695
This theorem is referenced by:  nla0001  43416
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