Theorem peano5OLD 7884

Description: Obsolete version of peano5 7883 as of 3-Oct-2024. (Contributed by NM, 18-Feb-2004.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
peano5OLD	⊢ ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴)

Distinct variable group:   𝑥,𝐴

Proof of Theorem peano5OLD

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eldifn 4127	. . . . . 6 ⊢ (𝑦 ∈ (ω ∖ 𝐴) → ¬ 𝑦 ∈ 𝐴)
2	1	adantl 482	. . . . 5 ⊢ (((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) ∧ 𝑦 ∈ (ω ∖ 𝐴)) → ¬ 𝑦 ∈ 𝐴)
3		eldifi 4126	. . . . . . . 8 ⊢ (𝑦 ∈ (ω ∖ 𝐴) → 𝑦 ∈ ω)
4		elndif 4128	. . . . . . . . 9 ⊢ (∅ ∈ 𝐴 → ¬ ∅ ∈ (ω ∖ 𝐴))
5		eleq1 2821	. . . . . . . . . . 11 ⊢ (𝑦 = ∅ → (𝑦 ∈ (ω ∖ 𝐴) ↔ ∅ ∈ (ω ∖ 𝐴)))
6	5	biimpcd 248	. . . . . . . . . 10 ⊢ (𝑦 ∈ (ω ∖ 𝐴) → (𝑦 = ∅ → ∅ ∈ (ω ∖ 𝐴)))
7	6	necon3bd 2954	. . . . . . . . 9 ⊢ (𝑦 ∈ (ω ∖ 𝐴) → (¬ ∅ ∈ (ω ∖ 𝐴) → 𝑦 ≠ ∅))
8	4, 7	mpan9 507	. . . . . . . 8 ⊢ ((∅ ∈ 𝐴 ∧ 𝑦 ∈ (ω ∖ 𝐴)) → 𝑦 ≠ ∅)
9		nnsuc 7872	. . . . . . . 8 ⊢ ((𝑦 ∈ ω ∧ 𝑦 ≠ ∅) → ∃𝑥 ∈ ω 𝑦 = suc 𝑥)
10	3, 8, 9	syl2an2 684	. . . . . . 7 ⊢ ((∅ ∈ 𝐴 ∧ 𝑦 ∈ (ω ∖ 𝐴)) → ∃𝑥 ∈ ω 𝑦 = suc 𝑥)
11	10	ad4ant13 749	. . . . . 6 ⊢ ((((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) ∧ 𝑦 ∈ (ω ∖ 𝐴)) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → ∃𝑥 ∈ ω 𝑦 = suc 𝑥)
12		nfra1 3281	. . . . . . . . . . 11 ⊢ Ⅎ𝑥∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)
13		nfv 1917	. . . . . . . . . . 11 ⊢ Ⅎ𝑥(𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅)
14	12, 13	nfan 1902	. . . . . . . . . 10 ⊢ Ⅎ𝑥(∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) ∧ (𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅))
15		nfv 1917	. . . . . . . . . 10 ⊢ Ⅎ𝑥 𝑦 ∈ 𝐴
16		rsp 3244	. . . . . . . . . . 11 ⊢ (∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) → (𝑥 ∈ ω → (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)))
17		vex 3478	. . . . . . . . . . . . . . . . . 18 ⊢ 𝑥 ∈ V
18	17	sucid 6446	. . . . . . . . . . . . . . . . 17 ⊢ 𝑥 ∈ suc 𝑥
19		eleq2 2822	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 = suc 𝑥 → (𝑥 ∈ 𝑦 ↔ 𝑥 ∈ suc 𝑥))
20	18, 19	mpbiri 257	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = suc 𝑥 → 𝑥 ∈ 𝑦)
21		eleq1 2821	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑦 = suc 𝑥 → (𝑦 ∈ ω ↔ suc 𝑥 ∈ ω))
22		peano2b 7871	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ ω ↔ suc 𝑥 ∈ ω)
23	21, 22	bitr4di 288	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 = suc 𝑥 → (𝑦 ∈ ω ↔ 𝑥 ∈ ω))
24		minel 4465	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑥 ∈ 𝑦 ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → ¬ 𝑥 ∈ (ω ∖ 𝐴))
25		neldif 4129	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑥 ∈ ω ∧ ¬ 𝑥 ∈ (ω ∖ 𝐴)) → 𝑥 ∈ 𝐴)
26	24, 25	sylan2 593	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑥 ∈ ω ∧ (𝑥 ∈ 𝑦 ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅)) → 𝑥 ∈ 𝐴)
27	26	exp32 421	. . . . . . . . . . . . . . . . 17 ⊢ (𝑥 ∈ ω → (𝑥 ∈ 𝑦 → (((ω ∖ 𝐴) ∩ 𝑦) = ∅ → 𝑥 ∈ 𝐴)))
28	23, 27	syl6bi 252	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = suc 𝑥 → (𝑦 ∈ ω → (𝑥 ∈ 𝑦 → (((ω ∖ 𝐴) ∩ 𝑦) = ∅ → 𝑥 ∈ 𝐴))))
29	20, 28	mpid 44	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = suc 𝑥 → (𝑦 ∈ ω → (((ω ∖ 𝐴) ∩ 𝑦) = ∅ → 𝑥 ∈ 𝐴)))
30	3, 29	syl5 34	. . . . . . . . . . . . . 14 ⊢ (𝑦 = suc 𝑥 → (𝑦 ∈ (ω ∖ 𝐴) → (((ω ∖ 𝐴) ∩ 𝑦) = ∅ → 𝑥 ∈ 𝐴)))
31	30	impd 411	. . . . . . . . . . . . 13 ⊢ (𝑦 = suc 𝑥 → ((𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → 𝑥 ∈ 𝐴))
32		eleq1a 2828	. . . . . . . . . . . . . 14 ⊢ (suc 𝑥 ∈ 𝐴 → (𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴))
33	32	com12 32	. . . . . . . . . . . . 13 ⊢ (𝑦 = suc 𝑥 → (suc 𝑥 ∈ 𝐴 → 𝑦 ∈ 𝐴))
34	31, 33	imim12d 81	. . . . . . . . . . . 12 ⊢ (𝑦 = suc 𝑥 → ((𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) → ((𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → 𝑦 ∈ 𝐴)))
35	34	com13 88	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → ((𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) → (𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴)))
36	16, 35	sylan9 508	. . . . . . . . . 10 ⊢ ((∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) ∧ (𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅)) → (𝑥 ∈ ω → (𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴)))
37	14, 15, 36	rexlimd 3263	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) ∧ (𝑦 ∈ (ω ∖ 𝐴) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅)) → (∃𝑥 ∈ ω 𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴))
38	37	exp32 421	. . . . . . . 8 ⊢ (∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) → (𝑦 ∈ (ω ∖ 𝐴) → (((ω ∖ 𝐴) ∩ 𝑦) = ∅ → (∃𝑥 ∈ ω 𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴))))
39	38	a1i 11	. . . . . . 7 ⊢ (∅ ∈ 𝐴 → (∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴) → (𝑦 ∈ (ω ∖ 𝐴) → (((ω ∖ 𝐴) ∩ 𝑦) = ∅ → (∃𝑥 ∈ ω 𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴)))))
40	39	imp41 426	. . . . . 6 ⊢ ((((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) ∧ 𝑦 ∈ (ω ∖ 𝐴)) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → (∃𝑥 ∈ ω 𝑦 = suc 𝑥 → 𝑦 ∈ 𝐴))
41	11, 40	mpd 15	. . . . 5 ⊢ ((((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) ∧ 𝑦 ∈ (ω ∖ 𝐴)) ∧ ((ω ∖ 𝐴) ∩ 𝑦) = ∅) → 𝑦 ∈ 𝐴)
42	2, 41	mtand 814	. . . 4 ⊢ (((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) ∧ 𝑦 ∈ (ω ∖ 𝐴)) → ¬ ((ω ∖ 𝐴) ∩ 𝑦) = ∅)
43	42	nrexdv 3149	. . 3 ⊢ ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ¬ ∃𝑦 ∈ (ω ∖ 𝐴)((ω ∖ 𝐴) ∩ 𝑦) = ∅)
44		ordom 7864	. . . . 5 ⊢ Ord ω
45		difss 4131	. . . . 5 ⊢ (ω ∖ 𝐴) ⊆ ω
46		tz7.5 6385	. . . . 5 ⊢ ((Ord ω ∧ (ω ∖ 𝐴) ⊆ ω ∧ (ω ∖ 𝐴) ≠ ∅) → ∃𝑦 ∈ (ω ∖ 𝐴)((ω ∖ 𝐴) ∩ 𝑦) = ∅)
47	44, 45, 46	mp3an12 1451	. . . 4 ⊢ ((ω ∖ 𝐴) ≠ ∅ → ∃𝑦 ∈ (ω ∖ 𝐴)((ω ∖ 𝐴) ∩ 𝑦) = ∅)
48	47	necon1bi 2969	. . 3 ⊢ (¬ ∃𝑦 ∈ (ω ∖ 𝐴)((ω ∖ 𝐴) ∩ 𝑦) = ∅ → (ω ∖ 𝐴) = ∅)
49	43, 48	syl 17	. 2 ⊢ ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → (ω ∖ 𝐴) = ∅)
50		ssdif0 4363	. 2 ⊢ (ω ⊆ 𝐴 ↔ (ω ∖ 𝐴) = ∅)
51	49, 50	sylibr 233	1 ⊢ ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 396   = wceq 1541   ∈ wcel 2106   ≠ wne 2940  ∀wral 3061  ∃wrex 3070   ∖ cdif 3945   ∩ cin 3947   ⊆ wss 3948  ∅c0 4322  Ord word 6363  suc csuc 6366  ωcom 7854

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pr 5427  ax-un 7724

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-clab 2710  df-cleq 2724  df-clel 2810  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-opab 5211  df-tr 5266  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-we 5633  df-ord 6367  df-on 6368  df-lim 6369  df-suc 6370  df-om 7855

This theorem is referenced by: (None)