Theorem omp1eom 7299

Description: Adding one to ω. (Contributed by Jim Kingdon, 10-Jul-2023.)

Assertion

Ref	Expression
omp1eom	⊢ (ω ⊔ 1o) ≈ ω

Proof of Theorem omp1eom

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		omex 4693	. . 3 ⊢ ω ∈ V
2		eqeq1 2237	. . . . . 6 ⊢ (𝑦 = 𝑥 → (𝑦 = ∅ ↔ 𝑥 = ∅))
3		fveq2 5642	. . . . . 6 ⊢ (𝑦 = 𝑥 → (inr‘𝑦) = (inr‘𝑥))
4		unieq 3903	. . . . . . 7 ⊢ (𝑦 = 𝑥 → ∪ 𝑦 = ∪ 𝑥)
5	4	fveq2d 5646	. . . . . 6 ⊢ (𝑦 = 𝑥 → (inl‘∪ 𝑦) = (inl‘∪ 𝑥))
6	2, 3, 5	ifbieq12d 3633	. . . . 5 ⊢ (𝑦 = 𝑥 → if(𝑦 = ∅, (inr‘𝑦), (inl‘∪ 𝑦)) = if(𝑥 = ∅, (inr‘𝑥), (inl‘∪ 𝑥)))
7	6	cbvmptv 4186	. . . 4 ⊢ (𝑦 ∈ ω ↦ if(𝑦 = ∅, (inr‘𝑦), (inl‘∪ 𝑦))) = (𝑥 ∈ ω ↦ if(𝑥 = ∅, (inr‘𝑥), (inl‘∪ 𝑥)))
8		suceq 4501	. . . . 5 ⊢ (𝑦 = 𝑥 → suc 𝑦 = suc 𝑥)
9	8	cbvmptv 4186	. . . 4 ⊢ (𝑦 ∈ ω ↦ suc 𝑦) = (𝑥 ∈ ω ↦ suc 𝑥)
10		eqid 2230	. . . 4 ⊢ case((𝑦 ∈ ω ↦ suc 𝑦), ( I ↾ 1o)) = case((𝑦 ∈ ω ↦ suc 𝑦), ( I ↾ 1o))
11	7, 9, 10	omp1eomlem 7298	. . 3 ⊢ (𝑦 ∈ ω ↦ if(𝑦 = ∅, (inr‘𝑦), (inl‘∪ 𝑦))):ω–1-1-onto→(ω ⊔ 1o)
12		f1oeng 6935	. . 3 ⊢ ((ω ∈ V ∧ (𝑦 ∈ ω ↦ if(𝑦 = ∅, (inr‘𝑦), (inl‘∪ 𝑦))):ω–1-1-onto→(ω ⊔ 1o)) → ω ≈ (ω ⊔ 1o))
13	1, 11, 12	mp2an 426	. 2 ⊢ ω ≈ (ω ⊔ 1o)
14	13	ensymi 6961	1 ⊢ (ω ⊔ 1o) ≈ ω

Syntax hints:   = wceq 1397   ∈ wcel 2201  Vcvv 2801  ∅c0 3493  ifcif 3604  ∪ cuni 3894   class class class wbr 4089   ↦ cmpt 4151   I cid 4387  suc csuc 4464  ωcom 4690   ↾ cres 4729  –1-1-onto→wf1o 5327  ‘cfv 5328  1_oc1o 6580   ≈ cen 6912   ⊔ cdju 7241  inlcinl 7249  inrcinr 7250  casecdjucase 7287

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-coll 4205  ax-sep 4208  ax-nul 4216  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-iinf 4688

This theorem depends on definitions:  df-bi 117  df-dc 842  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-ral 2514  df-rex 2515  df-reu 2516  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-nul 3494  df-if 3605  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  df-br 4090  df-opab 4152  df-mpt 4153  df-tr 4189  df-id 4392  df-iord 4465  df-on 4467  df-suc 4470  df-iom 4691  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-1st 6308  df-2nd 6309  df-1o 6587  df-er 6707  df-en 6915  df-dju 7242  df-inl 7251  df-inr 7252  df-case 7288

This theorem is referenced by:  difinfsn  7304  sbthom  16693