Theorem orngsqr 29135

Description: In an ordered ring, all squares are positive. (Contributed by Thierry Arnoux, 20-Jan-2018.)

Hypotheses

Ref	Expression
orngmul.0	⊢ 𝐵 = (Base‘𝑅)
orngmul.1	⊢ ≤ = (le‘𝑅)
orngmul.2	⊢ 0 = (0g‘𝑅)
orngmul.3	⊢ · = (.r‘𝑅)

Assertion

Ref	Expression
orngsqr	⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 0 ≤ (𝑋 · 𝑋))

Proof of Theorem orngsqr

Step	Hyp	Ref	Expression
1		simpll 786	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 𝑅 ∈ oRing)
2		simplr 788	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 𝑋 ∈ 𝐵)
3		simpr 476	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 0 ≤ 𝑋)
4		orngmul.0	. . . 4 ⊢ 𝐵 = (Base‘𝑅)
5		orngmul.1	. . . 4 ⊢ ≤ = (le‘𝑅)
6		orngmul.2	. . . 4 ⊢ 0 = (0g‘𝑅)
7		orngmul.3	. . . 4 ⊢ · = (.r‘𝑅)
8	4, 5, 6, 7	orngmul 29134	. . 3 ⊢ ((𝑅 ∈ oRing ∧ (𝑋 ∈ 𝐵 ∧ 0 ≤ 𝑋) ∧ (𝑋 ∈ 𝐵 ∧ 0 ≤ 𝑋)) → 0 ≤ (𝑋 · 𝑋))
9	1, 2, 3, 2, 3, 8	syl122anc 1327	. 2 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 0 ≤ (𝑋 · 𝑋))
10		simpll 786	. . . 4 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ oRing)
11		orngring 29131	. . . . . . 7 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ Ring)
12	11	ad2antrr 758	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ Ring)
13		ringgrp 18375	. . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp)
14	12, 13	syl 17	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ Grp)
15		simplr 788	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑋 ∈ 𝐵)
16		eqid 2610	. . . . . 6 ⊢ (invg‘𝑅) = (invg‘𝑅)
17	4, 16	grpinvcl 17290	. . . . 5 ⊢ ((𝑅 ∈ Grp ∧ 𝑋 ∈ 𝐵) → ((invg‘𝑅)‘𝑋) ∈ 𝐵)
18	14, 15, 17	syl2anc 691	. . . 4 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ((invg‘𝑅)‘𝑋) ∈ 𝐵)
19		orngogrp 29132	. . . . . . . 8 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ oGrp)
20		isogrp 29033	. . . . . . . . 9 ⊢ (𝑅 ∈ oGrp ↔ (𝑅 ∈ Grp ∧ 𝑅 ∈ oMnd))
21	20	simprbi 479	. . . . . . . 8 ⊢ (𝑅 ∈ oGrp → 𝑅 ∈ oMnd)
22	19, 21	syl 17	. . . . . . 7 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ oMnd)
23	10, 22	syl 17	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ oMnd)
24	4, 6	grpidcl 17273	. . . . . . 7 ⊢ (𝑅 ∈ Grp → 0 ∈ 𝐵)
25	14, 24	syl 17	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ∈ 𝐵)
26		simpl 472	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 𝑅 ∈ oRing)
27	11, 13, 24	3syl 18	. . . . . . . . . . . 12 ⊢ (𝑅 ∈ oRing → 0 ∈ 𝐵)
28	26, 27	syl 17	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 0 ∈ 𝐵)
29		simpr 476	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 𝑋 ∈ 𝐵)
30	26, 28, 29	3jca 1235	. . . . . . . . . 10 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → (𝑅 ∈ oRing ∧ 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵))
31		eqid 2610	. . . . . . . . . . . 12 ⊢ (lt‘𝑅) = (lt‘𝑅)
32	5, 31	pltle 16784	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ oRing ∧ 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵) → ( 0 (lt‘𝑅)𝑋 → 0 ≤ 𝑋))
33	32	con3dimp 456	. . . . . . . . . 10 ⊢ (((𝑅 ∈ oRing ∧ 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ¬ 0 (lt‘𝑅)𝑋)
34	30, 33	sylan 487	. . . . . . . . 9 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ¬ 0 (lt‘𝑅)𝑋)
35		omndtos 29036	. . . . . . . . . . . . 13 ⊢ (𝑅 ∈ oMnd → 𝑅 ∈ Toset)
36	22, 35	syl 17	. . . . . . . . . . . 12 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ Toset)
37	4, 5, 31	tosso 16859	. . . . . . . . . . . . . 14 ⊢ (𝑅 ∈ Toset → (𝑅 ∈ Toset ↔ ((lt‘𝑅) Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ ≤ )))
38	37	ibi 255	. . . . . . . . . . . . 13 ⊢ (𝑅 ∈ Toset → ((lt‘𝑅) Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ ≤ ))
39	38	simpld 474	. . . . . . . . . . . 12 ⊢ (𝑅 ∈ Toset → (lt‘𝑅) Or 𝐵)
40	10, 36, 39	3syl 18	. . . . . . . . . . 11 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (lt‘𝑅) Or 𝐵)
41		solin 4982	. . . . . . . . . . 11 ⊢ (((lt‘𝑅) Or 𝐵 ∧ ( 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵)) → ( 0 (lt‘𝑅)𝑋 ∨ 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ))
42	40, 25, 15, 41	syl12anc 1316	. . . . . . . . . 10 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 (lt‘𝑅)𝑋 ∨ 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ))
43		3orass 1034	. . . . . . . . . 10 ⊢ (( 0 (lt‘𝑅)𝑋 ∨ 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ) ↔ ( 0 (lt‘𝑅)𝑋 ∨ ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 )))
44	42, 43	sylib 207	. . . . . . . . 9 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 (lt‘𝑅)𝑋 ∨ ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 )))
45		orel1 396	. . . . . . . . 9 ⊢ (¬ 0 (lt‘𝑅)𝑋 → (( 0 (lt‘𝑅)𝑋 ∨ ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 )) → ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 )))
46	34, 44, 45	sylc 63	. . . . . . . 8 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ))
47		orcom 401	. . . . . . . . 9 ⊢ (( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ) ↔ (𝑋(lt‘𝑅) 0 ∨ 0 = 𝑋))
48		eqcom 2617	. . . . . . . . . 10 ⊢ ( 0 = 𝑋 ↔ 𝑋 = 0 )
49	48	orbi2i 540	. . . . . . . . 9 ⊢ ((𝑋(lt‘𝑅) 0 ∨ 0 = 𝑋) ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 ))
50	47, 49	bitri 263	. . . . . . . 8 ⊢ (( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ) ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 ))
51	46, 50	sylib 207	. . . . . . 7 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 ))
52		tospos 28989	. . . . . . . . 9 ⊢ (𝑅 ∈ Toset → 𝑅 ∈ Poset)
53	10, 36, 52	3syl 18	. . . . . . . 8 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ Poset)
54	4, 5, 31	pleval2 16788	. . . . . . . 8 ⊢ ((𝑅 ∈ Poset ∧ 𝑋 ∈ 𝐵 ∧ 0 ∈ 𝐵) → (𝑋 ≤ 0 ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 )))
55	53, 15, 25, 54	syl3anc 1318	. . . . . . 7 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋 ≤ 0 ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 )))
56	51, 55	mpbird 246	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑋 ≤ 0 )
57		eqid 2610	. . . . . . 7 ⊢ (+g‘𝑅) = (+g‘𝑅)
58	4, 5, 57	omndadd 29037	. . . . . 6 ⊢ ((𝑅 ∈ oMnd ∧ (𝑋 ∈ 𝐵 ∧ 0 ∈ 𝐵 ∧ ((invg‘𝑅)‘𝑋) ∈ 𝐵) ∧ 𝑋 ≤ 0 ) → (𝑋(+g‘𝑅)((invg‘𝑅)‘𝑋)) ≤ ( 0 (+g‘𝑅)((invg‘𝑅)‘𝑋)))
59	23, 15, 25, 18, 56, 58	syl131anc 1331	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋(+g‘𝑅)((invg‘𝑅)‘𝑋)) ≤ ( 0 (+g‘𝑅)((invg‘𝑅)‘𝑋)))
60	4, 57, 6, 16	grprinv 17292	. . . . . 6 ⊢ ((𝑅 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑋(+g‘𝑅)((invg‘𝑅)‘𝑋)) = 0 )
61	14, 15, 60	syl2anc 691	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋(+g‘𝑅)((invg‘𝑅)‘𝑋)) = 0 )
62	4, 57, 6	grplid 17275	. . . . . 6 ⊢ ((𝑅 ∈ Grp ∧ ((invg‘𝑅)‘𝑋) ∈ 𝐵) → ( 0 (+g‘𝑅)((invg‘𝑅)‘𝑋)) = ((invg‘𝑅)‘𝑋))
63	14, 18, 62	syl2anc 691	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 (+g‘𝑅)((invg‘𝑅)‘𝑋)) = ((invg‘𝑅)‘𝑋))
64	59, 61, 63	3brtr3d 4614	. . . 4 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ≤ ((invg‘𝑅)‘𝑋))
65	4, 5, 6, 7	orngmul 29134	. . . 4 ⊢ ((𝑅 ∈ oRing ∧ (((invg‘𝑅)‘𝑋) ∈ 𝐵 ∧ 0 ≤ ((invg‘𝑅)‘𝑋)) ∧ (((invg‘𝑅)‘𝑋) ∈ 𝐵 ∧ 0 ≤ ((invg‘𝑅)‘𝑋))) → 0 ≤ (((invg‘𝑅)‘𝑋) · ((invg‘𝑅)‘𝑋)))
66	10, 18, 64, 18, 64, 65	syl122anc 1327	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ≤ (((invg‘𝑅)‘𝑋) · ((invg‘𝑅)‘𝑋)))
67	4, 7, 16, 12, 15, 15	ringm2neg 18421	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (((invg‘𝑅)‘𝑋) · ((invg‘𝑅)‘𝑋)) = (𝑋 · 𝑋))
68	66, 67	breqtrd 4609	. 2 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ≤ (𝑋 · 𝑋))
69	9, 68	pm2.61dan 828	1 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 0 ≤ (𝑋 · 𝑋))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∨ wo 382   ∧ wa 383   ∨ w3o 1030   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977   ⊆ wss 3540   class class class wbr 4583   I cid 4948   Or wor 4958   ↾ cres 5040  ‘cfv 5804  (class class class)co 6549  Basecbs 15695  +_gcplusg 15768  ._rcmulr 15769  lecple 15775  0_gc0g 15923  Posetcpo 16763  ltcplt 16764  Tosetctos 16856  Grpcgrp 17245  inv_gcminusg 17246  Ringcrg 18370  oMndcomnd 29028  oGrpcogrp 29029  oRingcorng 29126

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-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

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-nel 2783  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-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-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-ndx 15698  df-slot 15699  df-base 15700  df-sets 15701  df-plusg 15781  df-0g 15925  df-preset 16751  df-poset 16769  df-plt 16781  df-toset 16857  df-mgm 17065  df-sgrp 17107  df-mnd 17118  df-grp 17248  df-minusg 17249  df-mgp 18313  df-ur 18325  df-ring 18372  df-omnd 29030  df-ogrp 29031  df-orng 29128

This theorem is referenced by:  orng0le1  29143