Theorem ontr2exmid 4268

Description: An ordinal transitivity law which implies excluded middle. (Contributed by Jim Kingdon, 17-Sep-2021.)

Hypothesis

Ref	Expression
ontr2exmid.1	⊢ ∀𝑥 ∈ On ∀𝑦∀𝑧 ∈ On ((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → 𝑥 ∈ 𝑧)

Assertion

Ref	Expression
ontr2exmid	⊢ (𝜑 ∨ ¬ 𝜑)

Distinct variable group:   𝜑,𝑥,𝑦,𝑧

Proof of Theorem ontr2exmid

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssrab2 3079	. . . . 5 ⊢ {𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅}
2		p0ex 3959	. . . . . 6 ⊢ {∅} ∈ V
3	2	prid2 3499	. . . . 5 ⊢ {∅} ∈ {∅, {∅}}
4		2ordpr 4267	. . . . . . 7 ⊢ Ord {∅, {∅}}
5		pp0ex 3960	. . . . . . . 8 ⊢ {∅, {∅}} ∈ V
6	5	elon 4129	. . . . . . 7 ⊢ ({∅, {∅}} ∈ On ↔ Ord {∅, {∅}})
7	4, 6	mpbir 144	. . . . . 6 ⊢ {∅, {∅}} ∈ On
8		ordtriexmidlem 4263	. . . . . . . 8 ⊢ {𝑤 ∈ {∅} ∣ 𝜑} ∈ On
9		ontr2exmid.1	. . . . . . . 8 ⊢ ∀𝑥 ∈ On ∀𝑦∀𝑧 ∈ On ((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → 𝑥 ∈ 𝑧)
10		sseq1 3020	. . . . . . . . . . . . 13 ⊢ (𝑥 = {𝑤 ∈ {∅} ∣ 𝜑} → (𝑥 ⊆ 𝑦 ↔ {𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦))
11	10	anbi1d 452	. . . . . . . . . . . 12 ⊢ (𝑥 = {𝑤 ∈ {∅} ∣ 𝜑} → ((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) ↔ ({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧)))
12		eleq1 2141	. . . . . . . . . . . 12 ⊢ (𝑥 = {𝑤 ∈ {∅} ∣ 𝜑} → (𝑥 ∈ 𝑧 ↔ {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧))
13	11, 12	imbi12d 232	. . . . . . . . . . 11 ⊢ (𝑥 = {𝑤 ∈ {∅} ∣ 𝜑} → (((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → 𝑥 ∈ 𝑧) ↔ (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)))
14	13	ralbidv 2368	. . . . . . . . . 10 ⊢ (𝑥 = {𝑤 ∈ {∅} ∣ 𝜑} → (∀𝑧 ∈ On ((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → 𝑥 ∈ 𝑧) ↔ ∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)))
15	14	albidv 1745	. . . . . . . . 9 ⊢ (𝑥 = {𝑤 ∈ {∅} ∣ 𝜑} → (∀𝑦∀𝑧 ∈ On ((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → 𝑥 ∈ 𝑧) ↔ ∀𝑦∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)))
16	15	rspcv 2697	. . . . . . . 8 ⊢ ({𝑤 ∈ {∅} ∣ 𝜑} ∈ On → (∀𝑥 ∈ On ∀𝑦∀𝑧 ∈ On ((𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → 𝑥 ∈ 𝑧) → ∀𝑦∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)))
17	8, 9, 16	mp2 16	. . . . . . 7 ⊢ ∀𝑦∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)
18		sseq2 3021	. . . . . . . . . . 11 ⊢ (𝑦 = {∅} → ({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ↔ {𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅}))
19		eleq1 2141	. . . . . . . . . . 11 ⊢ (𝑦 = {∅} → (𝑦 ∈ 𝑧 ↔ {∅} ∈ 𝑧))
20	18, 19	anbi12d 456	. . . . . . . . . 10 ⊢ (𝑦 = {∅} → (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) ↔ ({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧)))
21	20	imbi1d 229	. . . . . . . . 9 ⊢ (𝑦 = {∅} → ((({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧) ↔ (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)))
22	21	ralbidv 2368	. . . . . . . 8 ⊢ (𝑦 = {∅} → (∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧) ↔ ∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)))
23	2, 22	spcv 2691	. . . . . . 7 ⊢ (∀𝑦∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ 𝑦 ∧ 𝑦 ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧) → ∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧))
24	17, 23	ax-mp 7	. . . . . 6 ⊢ ∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧)
25		eleq2 2142	. . . . . . . . 9 ⊢ (𝑧 = {∅, {∅}} → ({∅} ∈ 𝑧 ↔ {∅} ∈ {∅, {∅}}))
26	25	anbi2d 451	. . . . . . . 8 ⊢ (𝑧 = {∅, {∅}} → (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) ↔ ({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ {∅, {∅}})))
27		eleq2 2142	. . . . . . . 8 ⊢ (𝑧 = {∅, {∅}} → ({𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧 ↔ {𝑤 ∈ {∅} ∣ 𝜑} ∈ {∅, {∅}}))
28	26, 27	imbi12d 232	. . . . . . 7 ⊢ (𝑧 = {∅, {∅}} → ((({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧) ↔ (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ {∅, {∅}}) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ {∅, {∅}})))
29	28	rspcv 2697	. . . . . 6 ⊢ ({∅, {∅}} ∈ On → (∀𝑧 ∈ On (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ 𝑧) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ 𝑧) → (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ {∅, {∅}}) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ {∅, {∅}})))
30	7, 24, 29	mp2 16	. . . . 5 ⊢ (({𝑤 ∈ {∅} ∣ 𝜑} ⊆ {∅} ∧ {∅} ∈ {∅, {∅}}) → {𝑤 ∈ {∅} ∣ 𝜑} ∈ {∅, {∅}})
31	1, 3, 30	mp2an 416	. . . 4 ⊢ {𝑤 ∈ {∅} ∣ 𝜑} ∈ {∅, {∅}}
32		elpri 3421	. . . 4 ⊢ ({𝑤 ∈ {∅} ∣ 𝜑} ∈ {∅, {∅}} → ({𝑤 ∈ {∅} ∣ 𝜑} = ∅ ∨ {𝑤 ∈ {∅} ∣ 𝜑} = {∅}))
33	31, 32	ax-mp 7	. . 3 ⊢ ({𝑤 ∈ {∅} ∣ 𝜑} = ∅ ∨ {𝑤 ∈ {∅} ∣ 𝜑} = {∅})
34		ordtriexmidlem2 4264	. . . 4 ⊢ ({𝑤 ∈ {∅} ∣ 𝜑} = ∅ → ¬ 𝜑)
35		0ex 3905	. . . . 5 ⊢ ∅ ∈ V
36		biidd 170	. . . . 5 ⊢ (𝑤 = ∅ → (𝜑 ↔ 𝜑))
37	35, 36	rabsnt 3467	. . . 4 ⊢ ({𝑤 ∈ {∅} ∣ 𝜑} = {∅} → 𝜑)
38	34, 37	orim12i 708	. . 3 ⊢ (({𝑤 ∈ {∅} ∣ 𝜑} = ∅ ∨ {𝑤 ∈ {∅} ∣ 𝜑} = {∅}) → (¬ 𝜑 ∨ 𝜑))
39	33, 38	ax-mp 7	. 2 ⊢ (¬ 𝜑 ∨ 𝜑)
40		orcom 679	. 2 ⊢ ((¬ 𝜑 ∨ 𝜑) ↔ (𝜑 ∨ ¬ 𝜑))
41	39, 40	mpbi 143	1 ⊢ (𝜑 ∨ ¬ 𝜑)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 102   ∨ wo 661  ∀wal 1282   = wceq 1284   ∈ wcel 1433  ∀wral 2348  {crab 2352   ⊆ wss 2973  ∅c0 3251  {csn 3398  {cpr 3399  Ord word 4117  Oncon0 4118

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-nul 3904  ax-pow 3948

This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-rab 2357  df-v 2603  df-dif 2975  df-un 2977  df-in 2979  df-ss 2986  df-nul 3252  df-pw 3384  df-sn 3404  df-pr 3405  df-uni 3602  df-tr 3876  df-iord 4121  df-on 4123  df-suc 4126

This theorem is referenced by: (None)