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Talk:Puiseux series

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769:
what these series really represent? Seems to me Calculus is not quite enough. I wrote Laurent series because there is a very close connection between Laurent's Theorem and Puiseux series, an important one I think, and should be explained somewhere in the article and just mentioning it in the lead is a first exposure. I specifically gave a real example of evaluating the series, using a specific root and explaining the conjugate series, to relax the reader as many are intimidated by multi-valued functions and giving a simple practical example they can understand gives them confidence to proceed further. Perhaps I could omit the term "conjugate" as that may be a bit too technical for the lead but I do feel explaining how to practically evaluate the series sometime soon in the discussion is helpful.
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year of calculus should in principle be able to understand what is a Puiseux series, and even the content of Puiseux's theorem, and therefore we should aspire to introduce those basic ideas using terminology that would not unnecessarily exclude those potential readers. Speaking personally, I have no training in complex analysis (I mean, I took some classes as an undergraduate nearly 2 decades ago that did not mention Puiseux series, as far as I recall), but I occasionally come across (formal) Puiseux series in my work, so your description of the audience excludes even some PhD-holding professional research mathematicians who might be interested in the article content. --
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geometry and Puiseux series can help with that. The problem of course is most everyone is intimidated by the fractional powers and more so when they are combined into an extremely complex object like the algebraic curve of f(x,y)=0. But this can be mitigated if the principles are presented in an intuitive and easy to follow manner by anyone interested in Complex Analysis. This I can do as I hope I did with the edit suggestions I made of the first paragraph above.
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article to readers who have heard of it and do not remember exactly the definition. I agree with JBL that the current version better fills these requirement than yours. In particular, as everyone who knows what a Laurent series knows also what a power series is, "power series" must be preferred to "Laurent series" in the first paragraph, even if it is worth to mention them later in the introduction, as it is done now.
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Puiseux series are distinguished by their fractional powers. That is a quintessential feature of the series quite different from power series with integer exponents. Is it unreasonable to expect readers to have some background in Complex Variables/Analysis to have any real success in understanding
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This sentence belongs to a subsection of section "Puiseux expansion of algebraic curves and functions", and thus concern only Puiseux expansion of algebraic curves. In this case, the statement is true. Similarly, the divergent Taylor expansion are always Taylor expansions of transcendental functions.
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or at least one which fully ramifies to better exhibit a conjugate class and include either links to the Newton Polygon algorithm or a short discussion. Next show some actual calculations using the series, especially convergence examples. Include a plot or two of the beautiful underlying geometry.
1399:. By the way, this section begins with two errors: by excluding branches with a vertical tangent, and, in the second paragraph by identifying a branch with a point (incidently, it is not here that normalization must be considered, as it suffices to define, as usually, a branch as an analytic curve). 521:
I am hesitant to go in and change the article however Puiseux series are intimidating to most everyone who encounters them and beginning the discussion here with an abstract description only frightens them further. Better to slowly ease them in with an undergraduate introduction to appeal to a much
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I was the one who placed the “too technical” template. I was redirected to this page from “Puiseux theorem,” to find out that the article only gives the “modern,” very algebraic statements. But more elementary theory does exist, and the discussion of it should precede the more “modern” formulations.
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OK for the vertical tangent. But this shows that the section is very badly written, as it may confuse readers who well know the subject. The sentence "let us define the branches of X at p to be the points ..." is definitively an identification of branches with some points. This could make sense if
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Did anyone check the links? For the last link (Algebraic Curves, R.J. Walker) I thought that I downloaded the book several days ago. But now when I open it, I see that it leads to a site where I should download it. The url type says that I need to register (that's why I didn't remove this link) -
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Another example is studying the branching geometry at singular points other than zero important for studying contour integration over these functions. Consider the pochhammer contour for the beta function. This is a difficult concept to understand without a clear understanding of the underlying
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You titled this section "Some suggestions for appealing to a wider audience". Appealing to as wide an audience as possible is a great idea; insisting that the audience must share your particular background and perspective is the opposite of that. It's quite clear that students who have taken one
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The article introduction is not for expressing the quintessence of a subject, but for summarizing the article and providing information that allows readers to decide whether they want read the article further. When technically possible, the introduction must also recall what is the subject of the
692:. And therefore this series actually represents three (single-valued) series which make up a single conjugate class of Puiseux series. The other two series of this class can be obtained by conjugation or most often computed by the usual method of Newton Polygon (see below for more information). 745:
I do not think this is an improvement. Power series are familiar to every single-variable calculus student (at least in the US), whereas Laurent series are almost never met (at least under that name) until later. Puiseux series need not be evaluated / evaluable (formal Puiseux series are a
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Ok, how about just state the expansion can be at any point but is frequently done at the origin. I think presenting the expansion at any point in the lead while perhaps focusing initially at the origin does not add unnecessary complexity and prepares the reader for a more comprehensive
1657:
Hello everyone, it seems confusing the way the completeness of Puiseux series is explained. Would someone (who is confortable enough with this subject) please explain better why the completeness is claimed for Puiseux series, then contradicted in the generalization section ?
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has a branch point at the origin with a vertical tangent. Also I do not see where a branch is being identified with a point. My example refers implicitly to a 3-cycle branch defined locally by three single-valued Puiseux series. Can you explain a bit further
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I can do this work which would in my opinion break a long-standing ice jam with this subject and attract further interest and discovery about this very beautiful subject so ask everyone associated with this topic to allow me to propose changes for your review.
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understanding. Consider Runge's Theorem which studies expansions centered at infinity. Casually and briefly mentioning this Theorem in the discussion for example gives a concrete application of Puiseux series and may interest the reader to pursue this further.
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perfectly reasonable object), and the technicalities thereof hardly seem lead-worthy. Compared with the trivial matter of what to call the variable, these are much larger issues. (I wouldn't object to changing the variable to
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I am also concerned with the excessive focus on the abstract algebra properties of the series and the omission of Puiseux's theorem, which I think more readers would be interested in.--
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I believe that I have solved, for the lead, the "too technical" issue. I have left the tag, because some work is yet needed in the body of the article. In particular the use of
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Is it unreasonable to expect readers to have some background in Complex Variables/Analysis to have any real success in understanding what these series really represent?
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It seems that the only difference with the current version is that Puiseux expansion are considered in the neighborhood of any point. As series Puiseux in
1749: 130: 1744: 1719:, but could not find any security policy in this case (and what if the link just changes - should we register ourselves to check that it is safe?..) 106: 847:
Copy that. I see some changes have already been made which I feel is an improvement. However, I feel one statement can be improved further.
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are important. But here we are in the lead, and is it standard, in an article introduction, to avoid, as possible, technical details (see
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The book proceeds to “give several versions of this theorem, of increasing sharpness.” I think this article should follow that example.
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the language of schemes would be assumed, but this is not the case, and it must not be the case if a wide audience is desired.
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I may rewrite the introductory sections of the article myself, but in the meantime, here is a suggestion on how to proceed.
567: 1395:). This suggest to detail Puiseux expansions outside the origin in a specific section that could be a first subsection of 33: 1413:
Ok, thanks for that reference. I do not see where branches with vertical tangents are being excluded. My example of
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to expand as Puiseux series the solutions of a bivariate equation should be explained and illustrated by examples.
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This sounds to me like a good thing to have in the article, and a bad thing to have in the lead of the article. --
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As two editors prefer the current version, please discuss (if needed) the current version rather than yours.
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The "T" only distracts from an already difficult subject. Use x. Also, would be more clear if written as:
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Original statement: (possibly zero excluded, in the case of a solution that tends to the infinity at when
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does not converge. This is to explain why I just deleted the completeness claim from the main page. --
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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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A good place to find a contemporary presentation of the elementary theory seems to be the book
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Recommended change: "(zero excluded in the case of expansion about a pole). For example
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has a pole at the origin so the Puiseux series for at least one branch contains a
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outside the lead. However, the current formulation can (and should) be improved.
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This is not a Puiseux series, the denominators in the exponents being unbounded.
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This does not belong to the lead, but will be worth to include in the section
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A suggestion on how to start making this article more widely accessible
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by C. T. C. Wall. The first sentence of Chapter 2 in that book says:
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Do people check these links or are they just scam / fishing / fraud?
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more wide audience, then follow with the more advanced description.
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that allow for fractional exponents. They were first introduced by
672:. The entire series is evaluated using a chosen cube root of 15: 408:
I am confused by this statement (in "Analytic convergence").
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The theorem of Puiseux states that a polynomial equation
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are not defined before, it seem better to keep the case
1610:{\displaystyle F(x,y)=1+(x+x^{2})y+(3x^{2}+x^{3})y^{3}} 537:
First paragraph about Puiseux series should be improved
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is expressed as a power series in fractional powers of
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Second paragraph in my opinion is not worded correctly
661:{\displaystyle g(x)=1+x^{1/3}+x^{2/3}+x^{5/3}+\cdots } 1509: 1419: 1360: 1294: 1261: 1211: 1176: 1127: 1032: 932: 903: 678: 570: 458: 418: 339: 319: 278: 168: 101:, a collaborative effort to improve the coverage of 1609: 1452: 1379: 1313: 1280: 1224: 1189: 1170:, can be expanded as Puiseux series about a point 1154: 1052: 1018: 918: 684: 660: 517:Some suggestions for appealing to a wider audience 485:Indeed this is wrong even for formal power series. 474: 432: 345: 325: 305: 215: 501:I have edited the article to clarify this point. 158:Counterexample for completeness of Puiseux series 1078:, when this section will be correctly written. 1019:{\displaystyle f(x,y)=1+(2+x)y+xy^{2}+xy^{3}=0} 722:harvtxt error: no target: CITEREFNewton1960 ( 8: 19: 47: 1601: 1588: 1575: 1550: 1508: 1434: 1430: 1418: 1371: 1359: 1299: 1293: 1272: 1260: 1216: 1210: 1181: 1175: 1126: 1042: 1033: 1031: 1004: 988: 931: 902: 677: 642: 638: 621: 617: 600: 596: 569: 467: 459: 457: 426: 425: 417: 338: 318: 277: 201: 194: 184: 173: 167: 444:in the sense that for a given choice of 711: 49: 1684:. Good point; thanks for pointing it. 813: 718: 1232:. In other words, every branch of an 7: 95:This article is within the scope of 1500:Next follow with a specific example 38:It is of interest to the following 1053:{\displaystyle {\frac {1}{x^{p}}}} 185: 14: 1750:Low-priority mathematics articles 1453:{\displaystyle 1+x^{1/3}+\cdots } 1240:) described by a Puiseux series. 564:in 1850. For example, the series 452:, they converge for small enough 115:Knowledge:WikiProject Mathematics 1745:Start-Class mathematics articles 1676: 1060:term so is undefined at zero." 118:Template:WikiProject Mathematics 82: 72: 51: 20: 1354:I agree that Puiseux series in 265:Singular points of plane curves 135:This article has been rated as 1594: 1565: 1556: 1537: 1525: 1513: 1143: 1131: 972: 960: 948: 936: 913: 907: 580: 574: 468: 460: 433:{\displaystyle K=\mathbb {C} } 294: 282: 1: 1694:18:33, 27 November 2021 (UTC) 1671:17:29, 27 November 2021 (UTC) 1393:MOS:MATH#Article introduction 399:06:24, 24 November 2015 (UTC) 109:and see a list of open tasks. 1705:first I didn't notice that. 1647:19:08, 10 October 2021 (UTC) 1632:11:56, 10 October 2021 (UTC) 1486:13:48, 11 October 2021 (UTC) 1471:12:39, 11 October 2021 (UTC) 1409:16:35, 10 October 2021 (UTC) 1350:16:02, 10 October 2021 (UTC) 1331:13:54, 10 October 2021 (UTC) 1250:11:56, 10 October 2021 (UTC) 1236:may be locally (in terms of 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in 98:WikiProject Mathematics 1611: 1454: 1381: 1315: 1282: 1226: 1191: 1156: 1116:Newton–Puiseux theorem 1054: 1020: 920: 686: 662: 483: 476: 434: 347: 327: 307: 217: 189: 28:This article is rated 1653:Completeness property 1612: 1455: 1382: 1316: 1283: 1227: 1225:{\displaystyle x_{0}} 1192: 1190:{\displaystyle x_{0}} 1157: 1055: 1021: 921: 687: 663: 477: 435: 410: 348: 328: 308: 218: 169: 1507: 1417: 1358: 1292: 1259: 1209: 1174: 1125: 1030: 930: 919:{\displaystyle y(x)} 901: 736:Puiseux (1850, 1851) 676: 568: 456: 416: 337: 317: 276: 166: 121:mathematics articles 1162:, its solutions in 1120:polynomial equation 475:{\displaystyle |x|} 1723:Yaroslav Nikitenko 1607: 1450: 1397:§ Algebraic curves 1377: 1311: 1278: 1222: 1187: 1152: 1050: 1016: 916: 682: 658: 472: 430: 343: 323: 303: 213: 90:Mathematics portal 34:content assessment 1112:Puiseux's theorem 1048: 685:{\displaystyle x} 346:{\displaystyle x} 326:{\displaystyle y} 209: 155: 154: 151: 150: 147: 146: 1757: 1680: 1616: 1614: 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986:y 982:x 979:+ 976:y 973:) 970:x 967:+ 964:2 961:( 958:+ 955:1 952:= 949:) 946:y 943:, 940:x 937:( 934:f 914:) 911:x 908:( 905:y 874:0 870:x 821:( 791:( 773:( 754:( 748:x 726:) 696:( 680:x 670:x 653:+ 648:3 644:/ 640:5 636:x 632:+ 627:3 623:/ 619:2 615:x 611:+ 606:3 602:/ 598:1 594:x 590:+ 587:1 584:= 581:) 578:x 575:( 572:g 526:( 505:( 489:( 469:| 465:x 461:| 450:x 446:n 427:C 423:= 420:K 380:( 361:( 353:. 341:x 321:y 301:0 298:= 295:) 292:y 289:, 286:x 283:( 280:f 242:( 227:( 207:k 204:1 199:+ 196:k 192:w 181:2 178:= 175:k 143:. 42::

Index


content assessment
WikiProjects
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Mathematics
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icon
Mathematics portal
WikiProject Mathematics
mathematics
the discussion
Low
project's priority scale
Thomas Bliem
talk
01:42, 2 June 2010 (UTC)
D.Lazard
talk
12:23, 30 October 2012 (UTC)
Singular points of plane curves
Reuqr
talk
16:53, 7 April 2011 (UTC)
Newton polygon
D.Lazard
talk
12:29, 30 October 2012 (UTC)
Jasper Deng
(talk)
06:24, 24 November 2015 (UTC)

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