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Talk:Unit (ring theory)

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convergent power series is a unit or not, you only have to check it's inverse is analytic at 0 or not. Also, some adding some concrete familiar example is helpful for readers. Theoretically, maybe formal power series are easier to handle, but surely more readers are familiar with convergent power series. If the imprecision of the definition is what bothers you than that's easy to fix, I think. --
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as the preferred notation for the unit group. I think that this more compact notation, introduced by Weil, is more common in the current mathematical literature, especially in algebraic number theory, which is probably the field in which unit groups are used most extensively. Another example: It is
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basically discusses an algebra of convergent power series. (since they start with continuous functions, you have to consider germs, not functions, though.) Since a germ of a holomorphic function is a power series, I still think "the algebra of convergent power series around 0" is a simple and typical
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I didn't use the term "analytic functions" because then the example would be too simple to be interesting. (I also admit since the article now at least mentions about a local ring, this example ceases to be interesting, because you can say this algebra is just a local ring.) Anyway, the point is I
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Oh, I thought "convergent" simplifies the idea. In my view, a formal power series is a generalization of a convergent power series. I thought the example was interesting because this is exactly how I learned about units and non-units. That's why I was surprised to find that the article didn't mean
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By saying "at 0" I thought that would mean "in some neighborhood of 0" (so disk or interval, etc.) Maybe "around 0" or "near 0" is better wording? (I admit this might be a little bit imprecise.) Also, I didn't think formal power series or rational functions are easier to hand, because to see if a
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But "a matrix with all diagonal elements equal to one, and all other elements equal to zero" is the very meaning that was intended earlier, isn't it? If so, suggest removing "more usually". I don't know enough about ring theory to be sure, though, so I won't make the change myself.
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By the way, I am not sure using the term "group scheme" is a good idea. Obviously that's what I had in mind but the article can and should be written to avoid the reference to scheme theory (the readers with an appropriate background can see we are talking about group scheme). --
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I believe that the terms "unit" and "invertible element" are synonymous in ring theory ("unit" in the sense of this article of course, not the multiplicative identity element) – if so then we should mention in the introduction that units also go by this name.
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know they're the same, but the fact that the reciprocal of an analytic function, non-zero at the specified point, is also analytic, is probably closer to "common sense" then that the inverse of a convergent power series is convergent. —
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In an algebra of convergent power series at the origin, units are precisely those who do not vanish at the origin. The non-units (i.e., those vanish at the origin) then form a unique maximal idea, (thus, this algebra is a local
650:"unity", and say that ''R'' is a "ring with unity" rather than "ring with a unit". Note also that the term '']'' more usually denotes a matrix with all diagonal elements equal to one, and all other elements equal to zero.) 1122:
Ah, I see. I think it matters of the perspective (a choice of the notation can certainly reflect that): in some theoretical sense, I think it is important (and worth mentioned in some form) that, for a commutative ring,
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U(R). With GL_1, it is not so much of an issue, since it is reasonable to take the point of view that GL_1(R) is defined to be the group of invertible 1 x 1 matrices. I would probably omit the mention of
1755:(note: "invertible element" is unambiguous in the context of ring theory since every element of a ring is additivity invertible, so clearly "invertible" must be refering to multiplicative invertibility) 1084: 1008: 493:? On an interval containing 0? On a disk in the complex plane containing 0? (Well, those are the same, and it's well-defined.) I guess we differ on the appropriate level of abstraction. " 1227: 309: 1838: 1485: 1046: 943: 850: 771: 1634: 1597: 1667: 1544: 1515: 1433: 1402: 1373: 1344: 1297: 1268: 1183: 1150: 897: 1106: 798: 147: 614:
Locally, of course (or depending on your definition of analyticity. I usually start with holomorphic = analytic.). Anyway, we are getting off-track. I noticed
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Is this mathematically incorrect? (I admit maybe I'm not understanding terminology correct, but I don't think the example itself is wrong.) --
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seems to make sense). Also, mentioning this representability fact should also help somehow put group ring construction somehow in context. --
513:, but it's easier to see in the case of formal power series or rational functions than for convergent power series or analytic functions. — 85: 1834: 1818: 648:
of the ring, in expressions like ''ring with a unit'' or '']'', and also e.g. '']''. (For this reason, some authors call 1<sub: -->
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is probably not common outside algebraic geometry". I suppose the question is: what is the common notation for the functor R --: -->
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isn't really have a discussion on a particular group scheme but the fact that a unit element corresponds to a ring homomorphism
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is used more commonly for the group scheme that represents the functor, not so much the functor itself, so I'd say that if
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I agree with this completely and support changing the notation in the article, the biggest reason being simply that U(
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has the property that the units are exactly those with a unit constanrt term. "Convergent" just adds confusion. —
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until a consensus is reached, and readers of this page are welcome to contribute to the discussion.
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the "(ring theory)" in the second one arose historically as a disambiguation from other meanings of
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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redirects here, maybe a bit misleadingly - since "unit (algebra)" could mean both, the 1 of a
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Unfortunately, the term ''unit'' is also used to refer to the identity element 1<sub: -->
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algebra, and any unit of an algebra, seen as a ring (and, also, the algebraic notion of
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is that common (but I don't know much about the non-commutative ring literature.) --
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every time one wanted to refer to the field of rational numbers. Nobody does that!
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example. If you disagree on this, then I'm fine with the removal of the example. --
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Even though both articles are a bit stub-like, care should be taken before merging
945:= the group of unit elements. Maybe you're thinking of a different definition? -- 1779: 409:
I disagree with merger also, these articles are talking about different things.
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is its ring of integers. I fixed this (and a bunch of other little things!)
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seems like a common notation for that functor. Also, the point of mentioning
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Knowledge:Redirects for discussion/Log/2022 December 10 § Invertible element
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refers to the multiplicative group and the unit group of a commutative ring
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for the unit group. It is just a group that happens to be the unit group.
1599:. This seems important; it contrasts to the fact that a ring homomorphism 1843: 671:
You're right. That last sentence is redundant. I'm going to remove it.
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U(R)? I don't think that's U (right?). At least in algebraic geometry,
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An editor has identified a potential problem with the redirect
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of the ring. But I think I get your point is that the notation
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is going to be mentioned at all, it is clearer to say that
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is the group scheme that represents the functor R --: -->
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in the example with integers? There is no reference to.
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Sorry for not being clearer. It is certainly true that
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That's what I wanted to mean when I say "the notation
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as a notation for the set of nonzero complex numbers.
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are different objects and merit IMHO seperate entries
270:, a collaborative effort to improve the coverage of 1079:{\displaystyle \operatorname {Frac} (\mathbb {Z} )} 619:example. What makes it not a "typical" example? -- 1661: 1628: 1591: 1538: 1509: 1479: 1427: 1396: 1367: 1338: 1291: 1262: 1221: 1177: 1144: 1100: 1078: 1040: 1002: 937: 891: 844: 814:I would say that not even algebraic geometers use 792: 765: 454:It doesn't seem that interesting an example. The 33:for general discussion of the article's subject. 1003:{\displaystyle \mathbb {G} _{m}(R)=R^{\times }} 571:didn't think it was confusing, but rather very 396:Personally, I'm rather against this merging. — 365:unit (= 1) of the (unital) ring (!!!) - while 1222:{\displaystyle \mathbb {G} _{m}(\mathbb {C} )} 552:rather than convergent power series. I mean, 903:is the same thing as multiplicative group of 505:of (or disk containing) 0, or the subring of 174: 8: 1683:I would refer to it simply as " the functor 1435:; that is straying from the topic of units. 188: 216: 1653: 1649: 1648: 1645: 1607: 1606: 1604: 1571: 1554: 1553: 1551: 1530: 1526: 1525: 1522: 1501: 1497: 1496: 1493: 1462: 1458: 1457: 1454: 1419: 1415: 1414: 1411: 1388: 1384: 1383: 1380: 1359: 1355: 1354: 1351: 1330: 1326: 1325: 1322: 1283: 1279: 1278: 1275: 1254: 1250: 1249: 1246: 1212: 1211: 1202: 1198: 1197: 1194: 1169: 1165: 1164: 1161: 1136: 1132: 1131: 1128: 1094: 1093: 1091: 1069: 1068: 1057: 1052:for the unit group would be like writing 1023: 1019: 1018: 1015: 994: 972: 968: 967: 964: 920: 916: 915: 912: 883: 879: 878: 875: 827: 823: 822: 819: 784: 778: 748: 744: 743: 740: 218: 1793:Thank you for pointing this out. The 7: 590:But convergent power series are the 264:This article is within the scope of 1480:{\displaystyle \mathbb {G} _{m}(R)} 1041:{\displaystyle \mathbb {G} _{m}(R)} 938:{\displaystyle \mathbb {G} _{m}(R)} 907:; i.e., so, for me, by definition, 845:{\displaystyle \mathbb {G} _{m}(R)} 766:{\displaystyle \mathbb {G} _{m}(R)} 497:", or "convergent power series" = " 361:is any invertible element, and not 207:It is of interest to the following 23:for discussing improvements to the 1185:the underlying abelian group, the 373:unit (neutral for multiplication). 14: 1872:Mid-priority mathematics articles 1629:{\displaystyle \mathbb {Z} \to R} 1592:{\displaystyle \mathbb {Z} \to R} 735:Well, there is also the notation 594:as analytic functions. It's not 284:Knowledge:WikiProject Mathematics 1867:Start-Class mathematics articles 1837:. This discussion will occur at 1824: 1662:{\displaystyle \mathbb {G} _{a}} 1539:{\displaystyle \mathbb {G} _{m}} 1510:{\displaystyle \mathbb {G} _{m}} 1428:{\displaystyle \mathbb {G} _{a}} 1397:{\displaystyle \mathbb {G} _{m}} 1368:{\displaystyle \mathbb {G} _{m}} 1339:{\displaystyle \mathbb {G} _{m}} 1292:{\displaystyle \mathbb {G} _{a}} 1263:{\displaystyle \mathbb {G} _{m}} 1178:{\displaystyle \mathbb {G} _{a}} 1145:{\displaystyle \mathbb {G} _{m}} 892:{\displaystyle \mathbb {G} _{m}} 509:defined at 0. They are are all 287:Template:WikiProject Mathematics 251: 241: 220: 189: 45:Click here to start a new topic. 1817:"Invertible element" listed at 304:This article has been rated as 1620: 1617: 1611: 1583: 1580: 1558: 1474: 1468: 1216: 1208: 1073: 1065: 1035: 1029: 984: 978: 932: 926: 839: 833: 760: 754: 1: 1853:16:21, 10 December 2022 (UTC) 1811:18:37, 29 December 2021 (UTC) 1788:12:37, 23 December 2021 (UTC) 1636:corresponds to an element of 730:18:35, 27 December 2020 (UTC) 681:03:01, 2 September 2009 (UTC) 278:and see a list of open tasks. 42:Put new text under old text. 1101:{\displaystyle \mathbb {Q} } 870:I am confused; the notation 1703:17:16, 4 January 2021 (UTC) 1679:09:08, 4 January 2021 (UTC) 1445:06:56, 4 January 2021 (UTC) 1313:05:50, 4 January 2021 (UTC) 1239:05:43, 4 January 2021 (UTC) 1118:06:00, 3 January 2021 (UTC) 955:05:50, 3 January 2021 (UTC) 866:05:46, 3 January 2021 (UTC) 810:05:06, 3 January 2021 (UTC) 793:{\displaystyle R^{\times }} 50:New to Knowledge? Welcome! 1888: 1010:. But I think that using 666:00:02, 16 March 2009 (UTC) 419:03:56, 10 March 2006 (UTC) 405:03:49, 10 March 2006 (UTC) 354:notice in particular that 1765:11:23, 23 July 2021 (UTC) 1741:11:18, 23 July 2021 (UTC) 303: 236: 215: 80:Be welcoming to newcomers 1819:Redirects for discussion 706:much more common to see 691:We could consider using 629:23:10, 30 May 2008 (UTC) 606:22:22, 30 May 2008 (UTC) 585:21:56, 30 May 2008 (UTC) 565:21:39, 30 May 2008 (UTC) 543:21:25, 30 May 2008 (UTC) 521:13:56, 30 May 2008 (UTC) 485:06:25, 30 May 2008 (UTC) 470:21:54, 29 May 2008 (UTC) 447:21:18, 29 May 2008 (UTC) 310:project's priority scale 1833:and has thus listed it 1797:is a number field, and 687:Notation for unit group 641:The introduction says: 267:WikiProject Mathematics 1727:) is less common than 1663: 1630: 1593: 1540: 1511: 1481: 1429: 1398: 1369: 1340: 1293: 1264: 1223: 1179: 1146: 1102: 1080: 1042: 1004: 939: 893: 846: 794: 767: 475:about this at all. -- 197:This article is rated 75:avoid personal attacks 1664: 1631: 1594: 1541: 1512: 1482: 1430: 1399: 1370: 1341: 1317:I think the notation 1294: 1265: 1224: 1180: 1147: 1103: 1081: 1043: 1005: 940: 894: 847: 795: 768: 100:Neutral point of view 1747:"Invertible element" 1644: 1603: 1550: 1521: 1492: 1453: 1410: 1379: 1350: 1321: 1274: 1245: 1229:does look weird. -- 1193: 1160: 1154:multiplicative group 1127: 1090: 1056: 1014: 963: 911: 874: 818: 777: 739: 649:'''R'''</sub: --> 637:Misleading Statement 428:About this example: 424:Power series example 392:for multiplication). 290:mathematics articles 105:No original research 1156:of the ring, while 495:Formal power series 456:formal power series 1831:Invertible element 1659: 1626: 1589: 1536: 1507: 1477: 1425: 1394: 1365: 1336: 1289: 1260: 1219: 1175: 1142: 1098: 1076: 1038: 1000: 935: 889: 842: 790: 763: 647:''R''</sub: --> 550:analytic functions 507:rational functions 499:analytic functions 359:unit (ring theory) 337:unit (ring theory) 259:Mathematics portal 203:content 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