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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.)
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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
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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. --
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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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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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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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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? --
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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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for the unit group. It is just a group that happens to be the unit group.
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You're right. That last sentence is redundant. I'm going to remove it.
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An editor has identified a potential problem with the redirect
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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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1629:{\displaystyle \mathbb {Z} \to R}
1592:{\displaystyle \mathbb {Z} \to R}
735:Well, there is also the notation
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1662:{\displaystyle \mathbb {G} _{a}}
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509:defined at 0. They are are all
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278:and see a list of open tasks.
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1101:{\displaystyle \mathbb {Q} }
870:I am confused; the notation
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793:{\displaystyle R^{\times }}
50:New to Knowledge? Welcome!
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1010:. But I think that using
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