User talk:Svennik

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AfC notification: Draft:Dual-complex numbers has a new comment

I've left a comment on your Articles for Creation submission, which can be viewed at Draft:Dual-complex numbers. Thanks! Dreamy Jazz 🎷 ^{talk to me | my contributions} 14:26, 28 May 2019 (UTC)[reply]

Hi @Dreamy Jazz:! Thanks for your comment. I've found several journal sources for the geometric construction. I've still kept the reference to Stack Exchange though. Is that fine? Svennik (talk) 18:21, 28 May 2019 (UTC)[reply]

I have replied on my talk page. Dreamy Jazz 🎷 ^{talk to me | my contributions} 20:23, 28 May 2019 (UTC)[reply]

Svennik, you are invited to the Teahouse!

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Your submission at Articles for creation: Dual-complex numbers has been accepted

Dual-complex numbers, which you submitted to Articles for creation, has been created.
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~Kvng (talk) 18:37, 3 September 2019 (UTC)[reply]

How is multiplication of dual-complex numbers defined?

I find it very strange that you tell us that multiplication of dual-complex numbers is non-commutative without ever telling us how to multiply dual-complex numbers. Could you add something about that to the article?

Also, it is worth noting that no other articles linked to Dual-complex number until I created a link in the "See also" section of Dual number a few minutes ago. The most frequent mistake in creating new Wikipedia articles is to create no links to the new article. Michael Hardy (talk) 19:54, 8 September 2019 (UTC)[reply]

Thanks for linking to the article. I have added a multiplication.

--Svennik (talk) 15:19, 9 September 2019 (UTC)[reply]

Don’t touch other users’ postings

[1] is unacceptable – see WP:TALKO. Don’t do anything with other users’ postings except for technical fixes and removal of obviously harmful content. Incnis Mrsi (talk) 12:01, 10 September 2019 (UTC)[reply]

I did ask you whether you wanted the discussion edited out. I assumed I had your OK, Incnis Mrsi. --Svennik (talk) 12:02, 10 September 2019 (UTC)[reply]

Re this diff is it mistake that you removed two messages, instead of just the last one? Gryllida (talk) 10:45, 13 September 2019 (UTC)[reply]

Do you think that back-and-forth insults between me and a blocked user are necessary to keep up? If you feel otherwise, you can undo the edit. I won't make a third attempt. --Svennik (talk) 12:52, 13 September 2019 (UTC)[reply]

Unsubstantiated expression of personal opinion in an article

I see that in this edit summary you referred to an edit of mine as "pedantic". To learn how and why you thought my edit was pedantic might be interesting. Far more important, however, is that your edit is in conflict with Wikipedia policy. Please do not repeat it unless and until you can provide a reliable source which shows that it is a recognised fact, not just the opinion of a Wikipedia editor. JBW (talk) Formerly known as JamesBWatson 20:08, 20 October 2019 (UTC)[reply]

@JBW: There's more than one possible interpretation of the term "dual-complex numbers". I've seen a paper talking about an algebra called the "dual-complex numbers" where the algebra was in fact

\mathbb {C} [x]/(x^{2})

- see here: https://hal.archives-ouvertes.fr/hal-01114178/document. Equally, the term has been used to refer to the same algebra as in the Wikipedia page. I think the remark is helpful for avoiding confusion. --Svennik (talk) 20:47, 20 October 2019 (UTC)[reply]

I described your edit as pedantic because I don't see how my remark about their name is harmful. If anything, I've argued that it's helpful. But I guess you've been here longer than me. --Svennik (talk) 21:10, 20 October 2019 (UTC)[reply]

You have asked on my talk page why I haven't responded to your message above. The answer is that I didn't have anything I thought worth saying. I am a little surprised that needs explaining. Nevertheless, I take it that what you meant was that you would be particularly interested in reading my thoughts on the matter, so I will respond here now. However, you may like to consider whether what you said was the best way of conveying the message that you would be interested in another editor's opinion.

Your comment about something being potentially confusing is editorial commentary, and as such does not belong in a Wikipedia article. In a book, a newspaper article, an academic paper, or any of various other kinds of writing it might be appropriate, but a Wikipedia article is not supposed to speak to its reader in its authors' voices, and commentary, advice, and opinions do not belong there.

Incidentally, your statement that the expression "dual-complex numbers" is ambiguous is interesting, and clearly a criticism of the existing article, which does not, as far as I can see, mention that ambiguity. However, I am not sure why you mention it in connection with your statement that the expression may be misleading because complex numbers and dual numbers have commutative multiplication. JBW (talk) Formerly known as JamesBWatson 08:17, 23 October 2019 (UTC)[reply]

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About Computable analysis

Hi Svennik, thanks for the interesting additions to the Computable analysis! I am not an expert on this topic, so I got a question regarding what you wrote there:

"A similarly surprising fact is that differentiation of complex functions is also computable, while the same result is false for real functions."

According to this paper (Corollary 1a), differentiation of smooth functions is computable. Since real analytic functions are smooth, differentiation is also computable for real analytic functions. On the other hand, Cauchy's integral formula applies only to (complex) analytic functions.

Thus, differentiation is computable for both real and complex analytic functions, right?

Saung Tadashi (talk) 21:53, 30 April 2023 (UTC)[reply]

The paper doesn't say that the differentiation operator is computable. It says that if a computable function is

C^{2}

, then its derivative is a computable function. That doesn't mean that there exists a procedure for finding this computable function, even though that function exists. Svennik (talk) 22:17, 30 April 2023 (UTC)[reply]

Got it! Thanks for clarifying :) Saung Tadashi (talk) 11:29, 1 May 2023 (UTC)[reply]

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