Theorem 1idpr 9730

Description: 1 is an identity element for positive real multiplication. Theorem 9-3.7(iv) of [Gleason] p. 124. (Contributed by NM, 2-Apr-1996.) (New usage is discouraged.)

Assertion

Ref	Expression
1idpr	⊢ (𝐴 ∈ P → (𝐴 ·P 1P) = 𝐴)

Proof of Theorem 1idpr

Dummy variables 𝑥 𝑦 𝑧 𝑤 𝑣 𝑢 𝑓 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-rex 2902	. . . . 5 ⊢ (∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔) ↔ ∃𝑔(𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔)))
2		19.42v 1905	. . . . . 6 ⊢ (∃𝑔(𝑥 <Q 𝑓 ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)))
3		elprnq 9692	. . . . . . . . . 10 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → 𝑓 ∈ Q)
4		breq1 4586	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑓 ·Q 𝑔) → (𝑥 <Q 𝑓 ↔ (𝑓 ·Q 𝑔) <Q 𝑓))
5		df-1p 9683	. . . . . . . . . . . . 13 ⊢ 1P = {𝑔 ∣ 𝑔 <Q 1Q}
6	5	abeq2i 2722	. . . . . . . . . . . 12 ⊢ (𝑔 ∈ 1P ↔ 𝑔 <Q 1Q)
7		ltmnq 9673	. . . . . . . . . . . . 13 ⊢ (𝑓 ∈ Q → (𝑔 <Q 1Q ↔ (𝑓 ·Q 𝑔) <Q (𝑓 ·Q 1Q)))
8		mulidnq 9664	. . . . . . . . . . . . . 14 ⊢ (𝑓 ∈ Q → (𝑓 ·Q 1Q) = 𝑓)
9	8	breq2d 4595	. . . . . . . . . . . . 13 ⊢ (𝑓 ∈ Q → ((𝑓 ·Q 𝑔) <Q (𝑓 ·Q 1Q) ↔ (𝑓 ·Q 𝑔) <Q 𝑓))
10	7, 9	bitrd 267	. . . . . . . . . . . 12 ⊢ (𝑓 ∈ Q → (𝑔 <Q 1Q ↔ (𝑓 ·Q 𝑔) <Q 𝑓))
11	6, 10	syl5rbb 272	. . . . . . . . . . 11 ⊢ (𝑓 ∈ Q → ((𝑓 ·Q 𝑔) <Q 𝑓 ↔ 𝑔 ∈ 1P))
12	4, 11	sylan9bbr 733	. . . . . . . . . 10 ⊢ ((𝑓 ∈ Q ∧ 𝑥 = (𝑓 ·Q 𝑔)) → (𝑥 <Q 𝑓 ↔ 𝑔 ∈ 1P))
13	3, 12	sylan 487	. . . . . . . . 9 ⊢ (((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) ∧ 𝑥 = (𝑓 ·Q 𝑔)) → (𝑥 <Q 𝑓 ↔ 𝑔 ∈ 1P))
14	13	ex 449	. . . . . . . 8 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (𝑥 = (𝑓 ·Q 𝑔) → (𝑥 <Q 𝑓 ↔ 𝑔 ∈ 1P)))
15	14	pm5.32rd 670	. . . . . . 7 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → ((𝑥 <Q 𝑓 ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ (𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔))))
16	15	exbidv 1837	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (∃𝑔(𝑥 <Q 𝑓 ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ ∃𝑔(𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔))))
17	2, 16	syl5rbbr 274	. . . . 5 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (∃𝑔(𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
18	1, 17	syl5bb 271	. . . 4 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔) ↔ (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
19	18	rexbidva 3031	. . 3 ⊢ (𝐴 ∈ P → (∃𝑓 ∈ 𝐴 ∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔) ↔ ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
20		1pr 9716	. . . 4 ⊢ 1P ∈ P
21		df-mp 9685	. . . . 5 ⊢ ·P = (𝑦 ∈ P, 𝑧 ∈ P ↦ {𝑤 ∣ ∃𝑢 ∈ 𝑦 ∃𝑣 ∈ 𝑧 𝑤 = (𝑢 ·Q 𝑣)})
22		mulclnq 9648	. . . . 5 ⊢ ((𝑢 ∈ Q ∧ 𝑣 ∈ Q) → (𝑢 ·Q 𝑣) ∈ Q)
23	21, 22	genpelv 9701	. . . 4 ⊢ ((𝐴 ∈ P ∧ 1P ∈ P) → (𝑥 ∈ (𝐴 ·P 1P) ↔ ∃𝑓 ∈ 𝐴 ∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔)))
24	20, 23	mpan2 703	. . 3 ⊢ (𝐴 ∈ P → (𝑥 ∈ (𝐴 ·P 1P) ↔ ∃𝑓 ∈ 𝐴 ∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔)))
25		prnmax 9696	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝑥 ∈ 𝐴) → ∃𝑓 ∈ 𝐴 𝑥 <Q 𝑓)
26		ltrelnq 9627	. . . . . . . . . . 11 ⊢ <Q ⊆ (Q × Q)
27	26	brel 5090	. . . . . . . . . 10 ⊢ (𝑥 <Q 𝑓 → (𝑥 ∈ Q ∧ 𝑓 ∈ Q))
28		vex 3176	. . . . . . . . . . . . . 14 ⊢ 𝑓 ∈ V
29		vex 3176	. . . . . . . . . . . . . 14 ⊢ 𝑥 ∈ V
30		fvex 6113	. . . . . . . . . . . . . 14 ⊢ (*Q‘𝑓) ∈ V
31		mulcomnq 9654	. . . . . . . . . . . . . 14 ⊢ (𝑦 ·Q 𝑧) = (𝑧 ·Q 𝑦)
32		mulassnq 9660	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ·Q 𝑧) ·Q 𝑤) = (𝑦 ·Q (𝑧 ·Q 𝑤))
33	28, 29, 30, 31, 32	caov12 6760	. . . . . . . . . . . . 13 ⊢ (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) = (𝑥 ·Q (𝑓 ·Q (*Q‘𝑓)))
34		recidnq 9666	. . . . . . . . . . . . . 14 ⊢ (𝑓 ∈ Q → (𝑓 ·Q (*Q‘𝑓)) = 1Q)
35	34	oveq2d 6565	. . . . . . . . . . . . 13 ⊢ (𝑓 ∈ Q → (𝑥 ·Q (𝑓 ·Q (*Q‘𝑓))) = (𝑥 ·Q 1Q))
36	33, 35	syl5eq 2656	. . . . . . . . . . . 12 ⊢ (𝑓 ∈ Q → (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) = (𝑥 ·Q 1Q))
37		mulidnq 9664	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ Q → (𝑥 ·Q 1Q) = 𝑥)
38	36, 37	sylan9eqr 2666	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ Q ∧ 𝑓 ∈ Q) → (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) = 𝑥)
39	38	eqcomd 2616	. . . . . . . . . 10 ⊢ ((𝑥 ∈ Q ∧ 𝑓 ∈ Q) → 𝑥 = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))))
40		ovex 6577	. . . . . . . . . . 11 ⊢ (𝑥 ·Q (*Q‘𝑓)) ∈ V
41		oveq2 6557	. . . . . . . . . . . 12 ⊢ (𝑔 = (𝑥 ·Q (*Q‘𝑓)) → (𝑓 ·Q 𝑔) = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))))
42	41	eqeq2d 2620	. . . . . . . . . . 11 ⊢ (𝑔 = (𝑥 ·Q (*Q‘𝑓)) → (𝑥 = (𝑓 ·Q 𝑔) ↔ 𝑥 = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓)))))
43	40, 42	spcev 3273	. . . . . . . . . 10 ⊢ (𝑥 = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) → ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))
44	27, 39, 43	3syl 18	. . . . . . . . 9 ⊢ (𝑥 <Q 𝑓 → ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))
45	44	a1i 11	. . . . . . . 8 ⊢ (𝑓 ∈ 𝐴 → (𝑥 <Q 𝑓 → ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)))
46	45	ancld 574	. . . . . . 7 ⊢ (𝑓 ∈ 𝐴 → (𝑥 <Q 𝑓 → (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
47	46	reximia 2992	. . . . . 6 ⊢ (∃𝑓 ∈ 𝐴 𝑥 <Q 𝑓 → ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)))
48	25, 47	syl 17	. . . . 5 ⊢ ((𝐴 ∈ P ∧ 𝑥 ∈ 𝐴) → ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)))
49	48	ex 449	. . . 4 ⊢ (𝐴 ∈ P → (𝑥 ∈ 𝐴 → ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
50		prcdnq 9694	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (𝑥 <Q 𝑓 → 𝑥 ∈ 𝐴))
51	50	adantrd 483	. . . . 5 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → ((𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)) → 𝑥 ∈ 𝐴))
52	51	rexlimdva 3013	. . . 4 ⊢ (𝐴 ∈ P → (∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)) → 𝑥 ∈ 𝐴))
53	49, 52	impbid 201	. . 3 ⊢ (𝐴 ∈ P → (𝑥 ∈ 𝐴 ↔ ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
54	19, 24, 53	3bitr4d 299	. 2 ⊢ (𝐴 ∈ P → (𝑥 ∈ (𝐴 ·P 1P) ↔ 𝑥 ∈ 𝐴))
55	54	eqrdv 2608	1 ⊢ (𝐴 ∈ P → (𝐴 ·P 1P) = 𝐴)

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475  ∃wex 1695   ∈ wcel 1977  ∃wrex 2897   class class class wbr 4583  ‘cfv 5804  (class class class)co 6549  Qcnq 9553  1_Qc1q 9554   ·_Q cmq 9557  *_Qcrq 9558   <_Q cltq 9559  Pcnp 9560  1_Pc1p 9561   ·_P cmp 9563

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-omul 7452  df-er 7629  df-ni 9573  df-pli 9574  df-mi 9575  df-lti 9576  df-plpq 9609  df-mpq 9610  df-ltpq 9611  df-enq 9612  df-nq 9613  df-erq 9614  df-plq 9615  df-mq 9616  df-1nq 9617  df-rq 9618  df-ltnq 9619  df-np 9682  df-1p 9683  df-mp 9685

This theorem is referenced by:  m1m1sr  9793  1idsr  9798