Theorem elrealeu 8144

Description: The real number mapping in elreal 8143 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 8143	. . . 4 ⊢ (𝐴 ∈ ℝ ↔ ∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
2	1	biimpi 120	. . 3 ⊢ (𝐴 ∈ ℝ → ∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
3		eqtr3 2252	. . . . . . . 8 ⊢ ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → ⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩)
4		0r 8065	. . . . . . . . . 10 ⊢ 0R ∈ R
5		opthg 4354	. . . . . . . . . 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 2615	. . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ R) → ∀𝑦 ∈ R ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → 𝑥 = 𝑦))
12	11	ralrimiva 2615	. . . 4 ⊢ (𝐴 ∈ ℝ → ∀𝑥 ∈ R ∀𝑦 ∈ R ((⟨𝑥, 0R⟩ = 𝐴 ∧ ⟨𝑦, 0R⟩ = 𝐴) → 𝑥 = 𝑦))
13		opeq1 3883	. . . . . 6 ⊢ (𝑥 = 𝑦 → ⟨𝑥, 0R⟩ = ⟨𝑦, 0R⟩)
14	13	eqeq1d 2241	. . . . 5 ⊢ (𝑥 = 𝑦 → (⟨𝑥, 0R⟩ = 𝐴 ↔ ⟨𝑦, 0R⟩ = 𝐴))
15	14	rmo4 3010	. . . 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 2762	. . 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 2763	. . 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 1398   ∈ wcel 2203  ∀wral 2520  ∃wrex 2521  ∃!wreu 2522  ∃*wrmo 2523  ⟨cop 3692  Rcnr 7612  0_Rc0r 7613  ℝcr 8126

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-iinf 4710

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-reu 2527  df-rmo 2528  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-eprel 4410  df-id 4414  df-po 4417  df-iso 4418  df-iord 4487  df-on 4489  df-suc 4492  df-iom 4713  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-recs 6536  df-irdg 6601  df-1o 6647  df-oadd 6651  df-omul 6652  df-er 6767  df-ec 6769  df-qs 6773  df-ni 7619  df-pli 7620  df-mi 7621  df-lti 7622  df-plpq 7659  df-mpq 7660  df-enq 7662  df-nqqs 7663  df-plqqs 7664  df-mqqs 7665  df-1nqqs 7666  df-rq 7667  df-ltnqqs 7668  df-inp 7781  df-i1p 7782  df-enr 8041  df-nr 8042  df-0r 8046  df-r 8137

This theorem is referenced by:  axcaucvglemcl  8210  axcaucvglemval  8212