Theorem 1idpr 9851

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 2918	. . . . 5 ⊢ (∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔) ↔ ∃𝑔(𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔)))
2		19.42v 1918	. . . . . 6 ⊢ (∃𝑔(𝑥 <Q 𝑓 ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)))
3		elprnq 9813	. . . . . . . . . 10 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → 𝑓 ∈ Q)
4		breq1 4656	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑓 ·Q 𝑔) → (𝑥 <Q 𝑓 ↔ (𝑓 ·Q 𝑔) <Q 𝑓))
5		df-1p 9804	. . . . . . . . . . . . 13 ⊢ 1P = {𝑔 ∣ 𝑔 <Q 1Q}
6	5	abeq2i 2735	. . . . . . . . . . . 12 ⊢ (𝑔 ∈ 1P ↔ 𝑔 <Q 1Q)
7		ltmnq 9794	. . . . . . . . . . . . 13 ⊢ (𝑓 ∈ Q → (𝑔 <Q 1Q ↔ (𝑓 ·Q 𝑔) <Q (𝑓 ·Q 1Q)))
8		mulidnq 9785	. . . . . . . . . . . . . 14 ⊢ (𝑓 ∈ Q → (𝑓 ·Q 1Q) = 𝑓)
9	8	breq2d 4665	. . . . . . . . . . . . 13 ⊢ (𝑓 ∈ Q → ((𝑓 ·Q 𝑔) <Q (𝑓 ·Q 1Q) ↔ (𝑓 ·Q 𝑔) <Q 𝑓))
10	7, 9	bitrd 268	. . . . . . . . . . . 12 ⊢ (𝑓 ∈ Q → (𝑔 <Q 1Q ↔ (𝑓 ·Q 𝑔) <Q 𝑓))
11	6, 10	syl5rbb 273	. . . . . . . . . . 11 ⊢ (𝑓 ∈ Q → ((𝑓 ·Q 𝑔) <Q 𝑓 ↔ 𝑔 ∈ 1P))
12	4, 11	sylan9bbr 737	. . . . . . . . . 10 ⊢ ((𝑓 ∈ Q ∧ 𝑥 = (𝑓 ·Q 𝑔)) → (𝑥 <Q 𝑓 ↔ 𝑔 ∈ 1P))
13	3, 12	sylan 488	. . . . . . . . 9 ⊢ (((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) ∧ 𝑥 = (𝑓 ·Q 𝑔)) → (𝑥 <Q 𝑓 ↔ 𝑔 ∈ 1P))
14	13	ex 450	. . . . . . . 8 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (𝑥 = (𝑓 ·Q 𝑔) → (𝑥 <Q 𝑓 ↔ 𝑔 ∈ 1P)))
15	14	pm5.32rd 672	. . . . . . 7 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → ((𝑥 <Q 𝑓 ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ (𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔))))
16	15	exbidv 1850	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (∃𝑔(𝑥 <Q 𝑓 ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ ∃𝑔(𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔))))
17	2, 16	syl5rbbr 275	. . . . 5 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (∃𝑔(𝑔 ∈ 1P ∧ 𝑥 = (𝑓 ·Q 𝑔)) ↔ (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
18	1, 17	syl5bb 272	. . . 4 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔) ↔ (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
19	18	rexbidva 3049	. . 3 ⊢ (𝐴 ∈ P → (∃𝑓 ∈ 𝐴 ∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔) ↔ ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
20		1pr 9837	. . . 4 ⊢ 1P ∈ P
21		df-mp 9806	. . . . 5 ⊢ ·P = (𝑦 ∈ P, 𝑧 ∈ P ↦ {𝑤 ∣ ∃𝑢 ∈ 𝑦 ∃𝑣 ∈ 𝑧 𝑤 = (𝑢 ·Q 𝑣)})
22		mulclnq 9769	. . . . 5 ⊢ ((𝑢 ∈ Q ∧ 𝑣 ∈ Q) → (𝑢 ·Q 𝑣) ∈ Q)
23	21, 22	genpelv 9822	. . . 4 ⊢ ((𝐴 ∈ P ∧ 1P ∈ P) → (𝑥 ∈ (𝐴 ·P 1P) ↔ ∃𝑓 ∈ 𝐴 ∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔)))
24	20, 23	mpan2 707	. . 3 ⊢ (𝐴 ∈ P → (𝑥 ∈ (𝐴 ·P 1P) ↔ ∃𝑓 ∈ 𝐴 ∃𝑔 ∈ 1P 𝑥 = (𝑓 ·Q 𝑔)))
25		prnmax 9817	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝑥 ∈ 𝐴) → ∃𝑓 ∈ 𝐴 𝑥 <Q 𝑓)
26		ltrelnq 9748	. . . . . . . . . . 11 ⊢ <Q ⊆ (Q × Q)
27	26	brel 5168	. . . . . . . . . 10 ⊢ (𝑥 <Q 𝑓 → (𝑥 ∈ Q ∧ 𝑓 ∈ Q))
28		vex 3203	. . . . . . . . . . . . . 14 ⊢ 𝑓 ∈ V
29		vex 3203	. . . . . . . . . . . . . 14 ⊢ 𝑥 ∈ V
30		fvex 6201	. . . . . . . . . . . . . 14 ⊢ (*Q‘𝑓) ∈ V
31		mulcomnq 9775	. . . . . . . . . . . . . 14 ⊢ (𝑦 ·Q 𝑧) = (𝑧 ·Q 𝑦)
32		mulassnq 9781	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ·Q 𝑧) ·Q 𝑤) = (𝑦 ·Q (𝑧 ·Q 𝑤))
33	28, 29, 30, 31, 32	caov12 6862	. . . . . . . . . . . . 13 ⊢ (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) = (𝑥 ·Q (𝑓 ·Q (*Q‘𝑓)))
34		recidnq 9787	. . . . . . . . . . . . . 14 ⊢ (𝑓 ∈ Q → (𝑓 ·Q (*Q‘𝑓)) = 1Q)
35	34	oveq2d 6666	. . . . . . . . . . . . 13 ⊢ (𝑓 ∈ Q → (𝑥 ·Q (𝑓 ·Q (*Q‘𝑓))) = (𝑥 ·Q 1Q))
36	33, 35	syl5eq 2668	. . . . . . . . . . . 12 ⊢ (𝑓 ∈ Q → (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) = (𝑥 ·Q 1Q))
37		mulidnq 9785	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ Q → (𝑥 ·Q 1Q) = 𝑥)
38	36, 37	sylan9eqr 2678	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ Q ∧ 𝑓 ∈ Q) → (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))) = 𝑥)
39	38	eqcomd 2628	. . . . . . . . . 10 ⊢ ((𝑥 ∈ Q ∧ 𝑓 ∈ Q) → 𝑥 = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))))
40		ovex 6678	. . . . . . . . . . 11 ⊢ (𝑥 ·Q (*Q‘𝑓)) ∈ V
41		oveq2 6658	. . . . . . . . . . . 12 ⊢ (𝑔 = (𝑥 ·Q (*Q‘𝑓)) → (𝑓 ·Q 𝑔) = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓))))
42	41	eqeq2d 2632	. . . . . . . . . . 11 ⊢ (𝑔 = (𝑥 ·Q (*Q‘𝑓)) → (𝑥 = (𝑓 ·Q 𝑔) ↔ 𝑥 = (𝑓 ·Q (𝑥 ·Q (*Q‘𝑓)))))
43	40, 42	spcev 3300	. . . . . . . . . 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 576	. . . . . . 7 ⊢ (𝑓 ∈ 𝐴 → (𝑥 <Q 𝑓 → (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
47	46	reximia 3009	. . . . . 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 450	. . . 4 ⊢ (𝐴 ∈ P → (𝑥 ∈ 𝐴 → ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
50		prcdnq 9815	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → (𝑥 <Q 𝑓 → 𝑥 ∈ 𝐴))
51	50	adantrd 484	. . . . 5 ⊢ ((𝐴 ∈ P ∧ 𝑓 ∈ 𝐴) → ((𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)) → 𝑥 ∈ 𝐴))
52	51	rexlimdva 3031	. . . 4 ⊢ (𝐴 ∈ P → (∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔)) → 𝑥 ∈ 𝐴))
53	49, 52	impbid 202	. . 3 ⊢ (𝐴 ∈ P → (𝑥 ∈ 𝐴 ↔ ∃𝑓 ∈ 𝐴 (𝑥 <Q 𝑓 ∧ ∃𝑔 𝑥 = (𝑓 ·Q 𝑔))))
54	19, 24, 53	3bitr4d 300	. 2 ⊢ (𝐴 ∈ P → (𝑥 ∈ (𝐴 ·P 1P) ↔ 𝑥 ∈ 𝐴))
55	54	eqrdv 2620	1 ⊢ (𝐴 ∈ P → (𝐴 ·P 1P) = 𝐴)

Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1483  ∃wex 1704   ∈ wcel 1990  ∃wrex 2913   class class class wbr 4653  ‘cfv 5888  (class class class)co 6650  Qcnq 9674  1_Qc1q 9675   ·_Q cmq 9678  *_Qcrq 9679   <_Q cltq 9680  Pcnp 9681  1_Pc1p 9682   ·_P cmp 9684

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-omul 7565  df-er 7742  df-ni 9694  df-pli 9695  df-mi 9696  df-lti 9697  df-plpq 9730  df-mpq 9731  df-ltpq 9732  df-enq 9733  df-nq 9734  df-erq 9735  df-plq 9736  df-mq 9737  df-1nq 9738  df-rq 9739  df-ltnq 9740  df-np 9803  df-1p 9804  df-mp 9806

This theorem is referenced by:  m1m1sr  9914  1idsr  9919