Wikipedia talk:Articles for deletion/External (mathematics)

Template:Old prod

Is this a real term?
Is this a concept used by mathematicians? The article cites no sources, and is only linked in article-space from binary function and scalar multiplication, and in both cases only as part of the phrase "external binary function". Furthermore, the "Usefulness" section ends with "Above all else, this is a reason this term should be of use in the mathematical community", which implies that it is not in use in mathematics, and that section makes the article seem like an argument for the use of a term that has not yet been adopted rather than a description of a concept that is in use. &mdash; Gwalla | Talk 22:40, 21 December 2011 (UTC)

No, this is not a real term in mathematics
Whoever wrote this article seems to be trying to invent many-sorted algebra, but that has already been invented. This article is pure research and should be removed, along with all the references to it. — Preceding unsigned comment added by 24.4.62.241 (talk) 14:26, 1 March 2019 (UTC)

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The articles exterior algebra and outer product are legitimate topics, but this article is not. It has been proposed for deletion today and will disappear in a week provided no one objects. Usually there is someone who objects, and in that case deletion can be approached through "nomination". Rgdboer (talk) 02:54, 3 December 2023 (UTC)


 * I seconded the proposal to delete this, but someone objected. If it goes through a more formal nomination, I'll give my opinion again. PatrickR2 (talk) 07:26, 10 December 2023 (UTC)

The single reference to John B. Fraleigh does not refer to the external concept except at page 78 (3rd edition) where an "external direct product" of groups is defined via component-wise products of the direct product of the sets underlying the groups. The case of commutative groups, where addition is the operation, is called the "external direct sum". These terms do not reflect the notion in this article. So the reference does not support the article. The "nomination" process is more involved and may be seen at WP:AFD. Repeated proposals are not entertained. — Rgdboer (talk) 01:35, 11 December 2023 (UTC)