Theorem 0sdom1dom 9246

Description: Strict dominance over 0 is the same as dominance over 1. For a shorter proof requiring ax-un 7729, see 0sdom1domALT . (Contributed by NM, 28-Sep-2004.) Avoid ax-un 7729. (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 8966	. . 3 ⊢ Rel ≺
2	1	brrelex2i 5711	. 2 ⊢ (∅ ≺ 𝐴 → 𝐴 ∈ V)
3		reldom 8965	. . 3 ⊢ Rel ≼
4	3	brrelex2i 5711	. 2 ⊢ (1o ≼ 𝐴 → 𝐴 ∈ V)
5		0sdomg 9118	. . 3 ⊢ (𝐴 ∈ V → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅))
6		n0 4328	. . . . 5 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴)
7		snssi 4784	. . . . . . 7 ⊢ (𝑥 ∈ 𝐴 → {𝑥} ⊆ 𝐴)
8		df1o2 8487	. . . . . . . . . . 11 ⊢ 1o = {∅}
9		0ex 5277	. . . . . . . . . . . 12 ⊢ ∅ ∈ V
10		vex 3463	. . . . . . . . . . . 12 ⊢ 𝑥 ∈ V
11		en2sn 9055	. . . . . . . . . . . 12 ⊢ ((∅ ∈ V ∧ 𝑥 ∈ V) → {∅} ≈ {𝑥})
12	9, 10, 11	mp2an 692	. . . . . . . . . . 11 ⊢ {∅} ≈ {𝑥}
13	8, 12	eqbrtri 5140	. . . . . . . . . 10 ⊢ 1o ≈ {𝑥}
14		endom 8993	. . . . . . . . . 10 ⊢ (1o ≈ {𝑥} → 1o ≼ {𝑥})
15	13, 14	ax-mp 5	. . . . . . . . 9 ⊢ 1o ≼ {𝑥}
16		domssr 9013	. . . . . . . . 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 1933	. . . . 5 ⊢ (𝐴 ∈ V → (∃𝑥 𝑥 ∈ 𝐴 → 1o ≼ 𝐴))
21	6, 20	biimtrid 242	. . . 4 ⊢ (𝐴 ∈ V → (𝐴 ≠ ∅ → 1o ≼ 𝐴))
22		1n0 8500	. . . . . . 7 ⊢ 1o ≠ ∅
23		dom0 9116	. . . . . . 7 ⊢ (1o ≼ ∅ ↔ 1o = ∅)
24	22, 23	nemtbir 3028	. . . . . 6 ⊢ ¬ 1o ≼ ∅
25		breq2 5123	. . . . . 6 ⊢ (𝐴 = ∅ → (1o ≼ 𝐴 ↔ 1o ≼ ∅))
26	24, 25	mtbiri 327	. . . . 5 ⊢ (𝐴 = ∅ → ¬ 1o ≼ 𝐴)
27	26	necon2ai 2961	. . . 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 1540  ∃wex 1779   ∈ wcel 2108   ≠ wne 2932  Vcvv 3459   ⊆ wss 3926  ∅c0 4308  {csn 4601   class class class wbr 5119  1_oc1o 8473   ≈ cen 8956   ≼ cdom 8957   ≺ csdm 8958

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2707  ax-sep 5266  ax-nul 5276  ax-pr 5402

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2539  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2809  df-ne 2933  df-ral 3052  df-rex 3061  df-rab 3416  df-v 3461  df-dif 3929  df-un 3931  df-ss 3943  df-nul 4309  df-if 4501  df-sn 4602  df-pr 4604  df-op 4608  df-br 5120  df-opab 5182  df-id 5548  df-xp 5660  df-rel 5661  df-cnv 5662  df-co 5663  df-dm 5664  df-rn 5665  df-suc 6358  df-fun 6533  df-fn 6534  df-f 6535  df-f1 6536  df-fo 6537  df-f1o 6538  df-1o 8480  df-en 8960  df-dom 8961  df-sdom 8962

This theorem is referenced by:  1sdom2  9248  sdom1OLD  9251  1sdom2dom  9255  djulepw  10207  fin45  10406  gchxpidm  10683  rankcf  10791  snct  32691