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Jasper Deng (talk | contribs) →Integral of an odd function: I see now |
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<ref>http://mathworld.wolfram.com/OddFunction.html</ref>
:{{ping|MathInclined}} This is not true. <math>\int_{-\infty}^{+\infty} x dx</math> does not even exist. If one wants to make sense of that, one must generally resort to [[Cauchy principal value]]s. This is not contradicted by the link you gave, which deals with bounded intervals only. The subtle point is the meaning of integrability over the whole real line.--[[User:Jasper Deng|Jasper Deng]] [[User talk:Jasper Deng|(talk)]] 07:45, 11 December 2017 (UTC)
== Teddy theorem ==
I have reverted twice the insertion of a section called "Teddy theorem" for the following reasons.
* One of the two provided sources is a web site that cannot be used as a source per [[WP:ELNO]]. The name "Teddy theorem" seems to not be used in this web site.
* The second source is not a textbook, but a self-biography of a mathematician. The section refers specifically to a chapter called "Preparing the war". I have not access to this chapter, but one may guess that the term "Teddy theorem" refers to the relationship between the author and other soldiers about mathematics. In any case, this does not means that the name is used elsewhere for this result. So, the name is not [[WP:Notability|notable]] enough for appearing in Wikipedia.
* Presented as it is, the theorem is wrong as supposing implicitely that all functions are infinitely differentiable. The way of preenting the result in the section "In calculus" is also confusing, but the title of the section lets the reader supposing that the functions considered are differentiable. However, it would be better to mention that in the section.
In summary, the edits add nothing else than unreliable references and a theorem name that is [[WP:OR]]. They cannot be accepted without breaking Wikipedia policies. [[User:D.Lazard|D.Lazard]] ([[User talk:D.Lazard|talk]]) 15:25, 7 November 2019 (UTC)
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