Theorem 0sdom1dom 9301

Description: Strict dominance over 0 is the same as dominance over 1. For a shorter proof requiring ax-un 7770, see 0sdom1domALT . (Contributed by NM, 28-Sep-2004.) Avoid ax-un 7770. (Revised by BTernaryTau, 7-Dec-2024.)

Assertion

Ref	Expression
0sdom1dom	⊢ (∅ ≺ 𝐴 ↔ 1o ≼ 𝐴)

Proof of Theorem 0sdom1dom

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		relsdom 9010	. . 3 ⊢ Rel ≺
2	1	brrelex2i 5757	. 2 ⊢ (∅ ≺ 𝐴 → 𝐴 ∈ V)
3		reldom 9009	. . 3 ⊢ Rel ≼
4	3	brrelex2i 5757	. 2 ⊢ (1o ≼ 𝐴 → 𝐴 ∈ V)
5		0sdomg 9170	. . 3 ⊢ (𝐴 ∈ V → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅))
6		n0 4376	. . . . 5 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴)
7		snssi 4833	. . . . . . 7 ⊢ (𝑥 ∈ 𝐴 → {𝑥} ⊆ 𝐴)
8		df1o2 8529	. . . . . . . . . . 11 ⊢ 1o = {∅}
9		0ex 5325	. . . . . . . . . . . 12 ⊢ ∅ ∈ V
10		vex 3492	. . . . . . . . . . . 12 ⊢ 𝑥 ∈ V
11		en2sn 9106	. . . . . . . . . . . 12 ⊢ ((∅ ∈ V ∧ 𝑥 ∈ V) → {∅} ≈ {𝑥})
12	9, 10, 11	mp2an 691	. . . . . . . . . . 11 ⊢ {∅} ≈ {𝑥}
13	8, 12	eqbrtri 5187	. . . . . . . . . 10 ⊢ 1o ≈ {𝑥}
14		endom 9039	. . . . . . . . . 10 ⊢ (1o ≈ {𝑥} → 1o ≼ {𝑥})
15	13, 14	ax-mp 5	. . . . . . . . 9 ⊢ 1o ≼ {𝑥}
16		domssr 9059	. . . . . . . . 9 ⊢ ((𝐴 ∈ V ∧ {𝑥} ⊆ 𝐴 ∧ 1o ≼ {𝑥}) → 1o ≼ 𝐴)
17	15, 16	mp3an3 1450	. . . . . . . 8 ⊢ ((𝐴 ∈ V ∧ {𝑥} ⊆ 𝐴) → 1o ≼ 𝐴)
18	17	ex 412	. . . . . . 7 ⊢ (𝐴 ∈ V → ({𝑥} ⊆ 𝐴 → 1o ≼ 𝐴))
19	7, 18	syl5 34	. . . . . 6 ⊢ (𝐴 ∈ V → (𝑥 ∈ 𝐴 → 1o ≼ 𝐴))
20	19	exlimdv 1932	. . . . 5 ⊢ (𝐴 ∈ V → (∃𝑥 𝑥 ∈ 𝐴 → 1o ≼ 𝐴))
21	6, 20	biimtrid 242	. . . 4 ⊢ (𝐴 ∈ V → (𝐴 ≠ ∅ → 1o ≼ 𝐴))
22		1n0 8544	. . . . . . 7 ⊢ 1o ≠ ∅
23		dom0 9168	. . . . . . 7 ⊢ (1o ≼ ∅ ↔ 1o = ∅)
24	22, 23	nemtbir 3044	. . . . . 6 ⊢ ¬ 1o ≼ ∅
25		breq2 5170	. . . . . 6 ⊢ (𝐴 = ∅ → (1o ≼ 𝐴 ↔ 1o ≼ ∅))
26	24, 25	mtbiri 327	. . . . 5 ⊢ (𝐴 = ∅ → ¬ 1o ≼ 𝐴)
27	26	necon2ai 2976	. . . 4 ⊢ (1o ≼ 𝐴 → 𝐴 ≠ ∅)
28	21, 27	impbid1 225	. . 3 ⊢ (𝐴 ∈ V → (𝐴 ≠ ∅ ↔ 1o ≼ 𝐴))
29	5, 28	bitrd 279	. 2 ⊢ (𝐴 ∈ V → (∅ ≺ 𝐴 ↔ 1o ≼ 𝐴))
30	2, 4, 29	pm5.21nii 378	1 ⊢ (∅ ≺ 𝐴 ↔ 1o ≼ 𝐴)

Syntax hints:   ↔ wb 206   = wceq 1537  ∃wex 1777   ∈ wcel 2108   ≠ wne 2946  Vcvv 3488   ⊆ wss 3976  ∅c0 4352  {csn 4648   class class class wbr 5166  1_oc1o 8515   ≈ cen 9000   ≼ cdom 9001   ≺ csdm 9002

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pr 5447

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-ss 3993  df-nul 4353  df-if 4549  df-sn 4649  df-pr 4651  df-op 4655  df-br 5167  df-opab 5229  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-suc 6401  df-fun 6575  df-fn 6576  df-f 6577  df-f1 6578  df-fo 6579  df-f1o 6580  df-1o 8522  df-en 9004  df-dom 9005  df-sdom 9006

This theorem is referenced by:  1sdom2  9303  sdom1OLD  9306  1sdom2dom  9310  djulepw  10262  fin45  10461  gchxpidm  10738  rankcf  10846  snct  32727