Theorem orngsqr 29804

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 790	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 𝑅 ∈ oRing)
2		simplr 792	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 𝑋 ∈ 𝐵)
3		simpr 477	. . 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 29803	. . 3 ⊢ ((𝑅 ∈ oRing ∧ (𝑋 ∈ 𝐵 ∧ 0 ≤ 𝑋) ∧ (𝑋 ∈ 𝐵 ∧ 0 ≤ 𝑋)) → 0 ≤ (𝑋 · 𝑋))
9	1, 2, 3, 2, 3, 8	syl122anc 1335	. 2 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ 0 ≤ 𝑋) → 0 ≤ (𝑋 · 𝑋))
10		simpll 790	. . . 4 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ oRing)
11		orngring 29800	. . . . . . 7 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ Ring)
12	11	ad2antrr 762	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ Ring)
13		ringgrp 18552	. . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp)
14	12, 13	syl 17	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑅 ∈ Grp)
15		simplr 792	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑋 ∈ 𝐵)
16		eqid 2622	. . . . . 6 ⊢ (invg‘𝑅) = (invg‘𝑅)
17	4, 16	grpinvcl 17467	. . . . 5 ⊢ ((𝑅 ∈ Grp ∧ 𝑋 ∈ 𝐵) → ((invg‘𝑅)‘𝑋) ∈ 𝐵)
18	14, 15, 17	syl2anc 693	. . . 4 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ((invg‘𝑅)‘𝑋) ∈ 𝐵)
19		orngogrp 29801	. . . . . . . 8 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ oGrp)
20		isogrp 29702	. . . . . . . . 9 ⊢ (𝑅 ∈ oGrp ↔ (𝑅 ∈ Grp ∧ 𝑅 ∈ oMnd))
21	20	simprbi 480	. . . . . . . 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 17450	. . . . . . 7 ⊢ (𝑅 ∈ Grp → 0 ∈ 𝐵)
25	14, 24	syl 17	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ∈ 𝐵)
26		simpl 473	. . . . . . . . . . 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 477	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 𝑋 ∈ 𝐵)
30	26, 28, 29	3jca 1242	. . . . . . . . . 10 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → (𝑅 ∈ oRing ∧ 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵))
31		eqid 2622	. . . . . . . . . . . 12 ⊢ (lt‘𝑅) = (lt‘𝑅)
32	5, 31	pltle 16961	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ oRing ∧ 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵) → ( 0 (lt‘𝑅)𝑋 → 0 ≤ 𝑋))
33	32	con3dimp 457	. . . . . . . . . 10 ⊢ (((𝑅 ∈ oRing ∧ 0 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ¬ 0 (lt‘𝑅)𝑋)
34	30, 33	sylan 488	. . . . . . . . 9 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ¬ 0 (lt‘𝑅)𝑋)
35		omndtos 29705	. . . . . . . . . . . . 13 ⊢ (𝑅 ∈ oMnd → 𝑅 ∈ Toset)
36	22, 35	syl 17	. . . . . . . . . . . 12 ⊢ (𝑅 ∈ oRing → 𝑅 ∈ Toset)
37	4, 5, 31	tosso 17036	. . . . . . . . . . . . . 14 ⊢ (𝑅 ∈ Toset → (𝑅 ∈ Toset ↔ ((lt‘𝑅) Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ ≤ )))
38	37	ibi 256	. . . . . . . . . . . . 13 ⊢ (𝑅 ∈ Toset → ((lt‘𝑅) Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ ≤ ))
39	38	simpld 475	. . . . . . . . . . . 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 5058	. . . . . . . . . . 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 1324	. . . . . . . . . 10 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 (lt‘𝑅)𝑋 ∨ 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ))
43		3orass 1040	. . . . . . . . . 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 208	. . . . . . . . 9 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 (lt‘𝑅)𝑋 ∨ ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 )))
45		orel1 397	. . . . . . . . 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 65	. . . . . . . 8 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ))
47		orcom 402	. . . . . . . . 9 ⊢ (( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ) ↔ (𝑋(lt‘𝑅) 0 ∨ 0 = 𝑋))
48		eqcom 2629	. . . . . . . . . 10 ⊢ ( 0 = 𝑋 ↔ 𝑋 = 0 )
49	48	orbi2i 541	. . . . . . . . 9 ⊢ ((𝑋(lt‘𝑅) 0 ∨ 0 = 𝑋) ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 ))
50	47, 49	bitri 264	. . . . . . . 8 ⊢ (( 0 = 𝑋 ∨ 𝑋(lt‘𝑅) 0 ) ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 ))
51	46, 50	sylib 208	. . . . . . 7 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 ))
52		tospos 29658	. . . . . . . . 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 16965	. . . . . . . 8 ⊢ ((𝑅 ∈ Poset ∧ 𝑋 ∈ 𝐵 ∧ 0 ∈ 𝐵) → (𝑋 ≤ 0 ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 )))
55	53, 15, 25, 54	syl3anc 1326	. . . . . . 7 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋 ≤ 0 ↔ (𝑋(lt‘𝑅) 0 ∨ 𝑋 = 0 )))
56	51, 55	mpbird 247	. . . . . 6 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 𝑋 ≤ 0 )
57		eqid 2622	. . . . . . 7 ⊢ (+g‘𝑅) = (+g‘𝑅)
58	4, 5, 57	omndadd 29706	. . . . . 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 1339	. . . . 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 17469	. . . . . 6 ⊢ ((𝑅 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑋(+g‘𝑅)((invg‘𝑅)‘𝑋)) = 0 )
61	14, 15, 60	syl2anc 693	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (𝑋(+g‘𝑅)((invg‘𝑅)‘𝑋)) = 0 )
62	4, 57, 6	grplid 17452	. . . . . 6 ⊢ ((𝑅 ∈ Grp ∧ ((invg‘𝑅)‘𝑋) ∈ 𝐵) → ( 0 (+g‘𝑅)((invg‘𝑅)‘𝑋)) = ((invg‘𝑅)‘𝑋))
63	14, 18, 62	syl2anc 693	. . . . 5 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → ( 0 (+g‘𝑅)((invg‘𝑅)‘𝑋)) = ((invg‘𝑅)‘𝑋))
64	59, 61, 63	3brtr3d 4684	. . . 4 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ≤ ((invg‘𝑅)‘𝑋))
65	4, 5, 6, 7	orngmul 29803	. . . 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 1335	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ≤ (((invg‘𝑅)‘𝑋) · ((invg‘𝑅)‘𝑋)))
67	4, 7, 16, 12, 15, 15	ringm2neg 18598	. . 3 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → (((invg‘𝑅)‘𝑋) · ((invg‘𝑅)‘𝑋)) = (𝑋 · 𝑋))
68	66, 67	breqtrd 4679	. 2 ⊢ (((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) ∧ ¬ 0 ≤ 𝑋) → 0 ≤ (𝑋 · 𝑋))
69	9, 68	pm2.61dan 832	1 ⊢ ((𝑅 ∈ oRing ∧ 𝑋 ∈ 𝐵) → 0 ≤ (𝑋 · 𝑋))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∨ wo 383   ∧ wa 384   ∨ w3o 1036   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990   ⊆ wss 3574   class class class wbr 4653   I cid 5023   Or wor 5034   ↾ cres 5116  ‘cfv 5888  (class class class)co 6650  Basecbs 15857  +_gcplusg 15941  ._rcmulr 15942  lecple 15948  0_gc0g 16100  Posetcpo 16940  ltcplt 16941  Tosetctos 17033  Grpcgrp 17422  inv_gcminusg 17423  Ringcrg 18547  oMndcomnd 29697  oGrpcogrp 29698  oRingcorng 29795

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-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

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-nel 2898  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-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-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-ndx 15860  df-slot 15861  df-base 15863  df-sets 15864  df-plusg 15954  df-0g 16102  df-preset 16928  df-poset 16946  df-plt 16958  df-toset 17034  df-mgm 17242  df-sgrp 17284  df-mnd 17295  df-grp 17425  df-minusg 17426  df-mgp 18490  df-ur 18502  df-ring 18549  df-omnd 29699  df-ogrp 29700  df-orng 29797

This theorem is referenced by:  orng0le1  29812