Theorem elrealeu 8016

Description: The real number mapping in elreal 8015 is unique. (Contributed by Jim Kingdon, 11-Jul-2021.)

Assertion

Ref	Expression
elrealeu	⊢ (𝐴 ∈ ℝ ↔ ∃!𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)

Distinct variable group:   𝑥,𝐴

Proof of Theorem elrealeu

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		elreal 8015	. . . 4 ⊢ (𝐴 ∈ ℝ ↔ ∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
2	1	biimpi 120	. . 3 ⊢ (𝐴 ∈ ℝ → ∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
3		eqtr3 2249	. . . . . . . 8 ⊢ ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → ⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩)
4		0r 7937	. . . . . . . . . 10 ⊢ 0R ∈ R
5		opthg 4324	. . . . . . . . . 10 ⊢ ((𝑥 ∈ R ∧ 0R ∈ R) → (⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩ ↔ (𝑥 = 𝑦 ∧ 0R = 0R)))
6	4, 5	mpan2 425	. . . . . . . . 9 ⊢ (𝑥 ∈ R → (⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩ ↔ (𝑥 = 𝑦 ∧ 0R = 0R)))
7	6	ad2antlr 489	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ ∧ 𝑥 ∈ R) ∧ 𝑦 ∈ R) → (⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩ ↔ (𝑥 = 𝑦 ∧ 0R = 0R)))
8	3, 7	imbitrid 154	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ 𝑥 ∈ R) ∧ 𝑦 ∈ R) → ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → (𝑥 = 𝑦 ∧ 0R = 0R)))
9		simpl 109	. . . . . . 7 ⊢ ((𝑥 = 𝑦 ∧ 0R = 0R) → 𝑥 = 𝑦)
10	8, 9	syl6 33	. . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝑥 ∈ R) ∧ 𝑦 ∈ R) → ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → 𝑥 = 𝑦))
11	10	ralrimiva 2603	. . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ R) → ∀𝑦 ∈ R ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → 𝑥 = 𝑦))
12	11	ralrimiva 2603	. . . 4 ⊢ (𝐴 ∈ ℝ → ∀𝑥 ∈ R ∀𝑦 ∈ R ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → 𝑥 = 𝑦))
13		opeq1 3857	. . . . . 6 ⊢ (𝑥 = 𝑦 → ⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩)
14	13	eqeq1d 2238	. . . . 5 ⊢ (𝑥 = 𝑦 → (⟨𝑥, 0R⟩ = 𝐴 ↔ ⟨𝑦, 0R⟩ = 𝐴))
15	14	rmo4 2996	. . . 4 ⊢ (∃*𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴 ↔ ∀𝑥 ∈ R ∀𝑦 ∈ R ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → 𝑥 = 𝑦))
16	12, 15	sylibr 134	. . 3 ⊢ (𝐴 ∈ ℝ → ∃*𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
17		reu5 2749	. . 3 ⊢ (∃!𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴 ↔ (∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴 ∧ ∃*𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴))
18	2, 16, 17	sylanbrc 417	. 2 ⊢ (𝐴 ∈ ℝ → ∃!𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
19		reurex 2750	. . 3 ⊢ (∃!𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴 → ∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
20	19, 1	sylibr 134	. 2 ⊢ (∃!𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴 → 𝐴 ∈ ℝ)
21	18, 20	impbii 126	1 ⊢ (𝐴 ∈ ℝ ↔ ∃!𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1395   ∈ wcel 2200  ∀wral 2508  ∃wrex 2509  ∃!wreu 2510  ∃*wrmo 2511  ⟨cop 3669  Rcnr 7484  0_Rc0r 7485  ℝcr 7998

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-nul 4210  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-iinf 4680

This theorem depends on definitions:  df-bi 117  df-dc 840  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rmo 2516  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-iun 3967  df-br 4084  df-opab 4146  df-mpt 4147  df-tr 4183  df-eprel 4380  df-id 4384  df-po 4387  df-iso 4388  df-iord 4457  df-on 4459  df-suc 4462  df-iom 4683  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-ov 6004  df-oprab 6005  df-mpo 6006  df-1st 6286  df-2nd 6287  df-recs 6451  df-irdg 6516  df-1o 6562  df-oadd 6566  df-omul 6567  df-er 6680  df-ec 6682  df-qs 6686  df-ni 7491  df-pli 7492  df-mi 7493  df-lti 7494  df-plpq 7531  df-mpq 7532  df-enq 7534  df-nqqs 7535  df-plqqs 7536  df-mqqs 7537  df-1nqqs 7538  df-rq 7539  df-ltnqqs 7540  df-inp 7653  df-i1p 7654  df-enr 7913  df-nr 7914  df-0r 7918  df-r 8009

This theorem is referenced by:  axcaucvglemcl  8082  axcaucvglemval  8084