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Theorem 0sdom1dom 9216
Description: Strict dominance over 0 is the same as dominance over 1. For a shorter proof requiring ax-un 7745, see 0sdom1domALT . (Contributed by NM, 28-Sep-2004.) Avoid ax-un 7745. (Revised by BTernaryTau, 7-Dec-2024.)
Assertion
Ref Expression
0sdom1dom (∅ ≺ 𝐴 ↔ 1o𝐴)

Proof of Theorem 0sdom1dom
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 relsdom 8959 . . 3 Rel ≺
21brrelex2i 5723 . 2 (∅ ≺ 𝐴𝐴 ∈ V)
3 reldom 8958 . . 3 Rel ≼
43brrelex2i 5723 . 2 (1o𝐴𝐴 ∈ V)
5 0sdomg 9104 . . 3 (𝐴 ∈ V → (∅ ≺ 𝐴𝐴 ≠ ∅))
6 n0 4310 . . . . 5 (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥𝐴)
7 snssi 4756 . . . . . . 7 (𝑥𝐴 → {𝑥} ⊆ 𝐴)
8 df1o2 8469 . . . . . . . . . . 11 1o = {∅}
9 0ex 5275 . . . . . . . . . . . 12 ∅ ∈ V
10 vex 3462 . . . . . . . . . . . 12 𝑥 ∈ V
11 en2sn 9048 . . . . . . . . . . . 12 ((∅ ∈ V ∧ 𝑥 ∈ V) → {∅} ≈ {𝑥})
129, 10, 11mp2an 705 . . . . . . . . . . 11 {∅} ≈ {𝑥}
138, 12eqbrtri 5137 . . . . . . . . . 10 1o ≈ {𝑥}
14 endom 8985 . . . . . . . . . 10 (1o ≈ {𝑥} → 1o ≼ {𝑥})
1513, 14ax-mp 5 . . . . . . . . 9 1o ≼ {𝑥}
16 domssr 9005 . . . . . . . . 9 ((𝐴 ∈ V ∧ {𝑥} ⊆ 𝐴 ∧ 1o ≼ {𝑥}) → 1o𝐴)
1715, 16mp3an3 1479 . . . . . . . 8 ((𝐴 ∈ V ∧ {𝑥} ⊆ 𝐴) → 1o𝐴)
1817ex 418 . . . . . . 7 (𝐴 ∈ V → ({𝑥} ⊆ 𝐴 → 1o𝐴))
197, 18syl5 35 . . . . . 6 (𝐴 ∈ V → (𝑥𝐴 → 1o𝐴))
2019exlimdv 1966 . . . . 5 (𝐴 ∈ V → (∃𝑥 𝑥𝐴 → 1o𝐴))
216, 20biimtrid 245 . . . 4 (𝐴 ∈ V → (𝐴 ≠ ∅ → 1o𝐴))
22 1n0 8481 . . . . . . 7 1o ≠ ∅
23 dom0 9103 . . . . . . 7 (1o ≼ ∅ ↔ 1o = ∅)
2422, 23nemtbir 3057 . . . . . 6 ¬ 1o ≼ ∅
25 breq2 5118 . . . . . 6 (𝐴 = ∅ → (1o𝐴 ↔ 1o ≼ ∅))
2624, 25mtbiri 330 . . . . 5 (𝐴 = ∅ → ¬ 1o𝐴)
2726necon2ai 2990 . . . 4 (1o𝐴𝐴 ≠ ∅)
2821, 27impbid1 228 . . 3 (𝐴 ∈ V → (𝐴 ≠ ∅ ↔ 1o𝐴))
295, 28bitrd 282 . 2 (𝐴 ∈ V → (∅ ≺ 𝐴 ↔ 1o𝐴))
302, 4, 29pm5.21nii 381 1 (∅ ≺ 𝐴 ↔ 1o𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209   = wceq 1570  wex 1812  wcel 2146  wne 2961  Vcvv 3458  wss 3908  c0 4289  {csn 4594   class class class wbr 5114  1oc1o 8455  cen 8949  cdom 8950  csdm 8951
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2738  ax-sep 5262  ax-nul 5274  ax-pr 5409
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2570  df-clab 2745  df-cleq 2758  df-clel 2841  df-ne 2962  df-ral 3083  df-rex 3093  df-rab 3420  df-v 3460  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-br 5115  df-opab 5179  df-id 5561  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-suc 6373  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-1o 8462  df-en 8953  df-dom 8954  df-sdom 8955
This theorem is used by:  1sdom2  9218  1sdom2dom  9224  djulepw  10195  fin45  10394  gchxpidm  10672  rankcf  10780  snct  33094
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