Theorem 0sdom1dom 9139

Description: Strict dominance over 0 is the same as dominance over 1. For a shorter proof requiring ax-un 7676, see 0sdom1domALT . (Contributed by NM, 28-Sep-2004.) Avoid ax-un 7676. (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 8884	. . 3 ⊢ Rel ≺
2	1	brrelex2i 5678	. 2 ⊢ (∅ ≺ 𝐴 → 𝐴 ∈ V)
3		reldom 8883	. . 3 ⊢ Rel ≼
4	3	brrelex2i 5678	. 2 ⊢ (1o ≼ 𝐴 → 𝐴 ∈ V)
5		0sdomg 9028	. . 3 ⊢ (𝐴 ∈ V → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅))
6		n0 4302	. . . . 5 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴)
7		snssi 4761	. . . . . . 7 ⊢ (𝑥 ∈ 𝐴 → {𝑥} ⊆ 𝐴)
8		df1o2 8400	. . . . . . . . . . 11 ⊢ 1o = {∅}
9		0ex 5249	. . . . . . . . . . . 12 ⊢ ∅ ∈ V
10		vex 3441	. . . . . . . . . . . 12 ⊢ 𝑥 ∈ V
11		en2sn 8972	. . . . . . . . . . . 12 ⊢ ((∅ ∈ V ∧ 𝑥 ∈ V) → {∅} ≈ {𝑥})
12	9, 10, 11	mp2an 692	. . . . . . . . . . 11 ⊢ {∅} ≈ {𝑥}
13	8, 12	eqbrtri 5116	. . . . . . . . . 10 ⊢ 1o ≈ {𝑥}
14		endom 8910	. . . . . . . . . 10 ⊢ (1o ≈ {𝑥} → 1o ≼ {𝑥})
15	13, 14	ax-mp 5	. . . . . . . . 9 ⊢ 1o ≼ {𝑥}
16		domssr 8930	. . . . . . . . 9 ⊢ ((𝐴 ∈ V ∧ {𝑥} ⊆ 𝐴 ∧ 1o ≼ {𝑥}) → 1o ≼ 𝐴)
17	15, 16	mp3an3 1452	. . . . . . . 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 1934	. . . . 5 ⊢ (𝐴 ∈ V → (∃𝑥 𝑥 ∈ 𝐴 → 1o ≼ 𝐴))
21	6, 20	biimtrid 242	. . . 4 ⊢ (𝐴 ∈ V → (𝐴 ≠ ∅ → 1o ≼ 𝐴))
22		1n0 8411	. . . . . . 7 ⊢ 1o ≠ ∅
23		dom0 9027	. . . . . . 7 ⊢ (1o ≼ ∅ ↔ 1o = ∅)
24	22, 23	nemtbir 3025	. . . . . 6 ⊢ ¬ 1o ≼ ∅
25		breq2 5099	. . . . . 6 ⊢ (𝐴 = ∅ → (1o ≼ 𝐴 ↔ 1o ≼ ∅))
26	24, 25	mtbiri 327	. . . . 5 ⊢ (𝐴 = ∅ → ¬ 1o ≼ 𝐴)
27	26	necon2ai 2958	. . . 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 1541  ∃wex 1780   ∈ wcel 2113   ≠ wne 2929  Vcvv 3437   ⊆ wss 3898  ∅c0 4282  {csn 4577   class class class wbr 5095  1_oc1o 8386   ≈ cen 8874   ≼ cdom 8875   ≺ csdm 8876

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-ext 2705  ax-sep 5238  ax-nul 5248  ax-pr 5374

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-mo 2537  df-clab 2712  df-cleq 2725  df-clel 2808  df-ne 2930  df-ral 3049  df-rex 3058  df-rab 3397  df-v 3439  df-dif 3901  df-un 3903  df-ss 3915  df-nul 4283  df-if 4477  df-sn 4578  df-pr 4580  df-op 4584  df-br 5096  df-opab 5158  df-id 5516  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-rn 5632  df-suc 6319  df-fun 6490  df-fn 6491  df-f 6492  df-f1 6493  df-fo 6494  df-f1o 6495  df-1o 8393  df-en 8878  df-dom 8879  df-sdom 8880

This theorem is referenced by:  1sdom2  9141  1sdom2dom  9147  djulepw  10093  fin45  10292  gchxpidm  10569  rankcf  10677  snct  32701