| Revision as of 18:40, 12 September 2010 editJohnBlackburne (talk | contribs)Extended confirmed users, Pending changes reviewers, Rollbackers30,799 edits →Vector quadruple product: comments← Previous edit | Revision as of 19:44, 12 September 2010 edit undoBrews ohare (talk | contribs)47,831 edits →Vector quadruple product: sensible courseNext edit → | ||
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| :: a beginning. ] (]) 18:38, 12 September 2010 (UTC) | :: a beginning. ] (]) 18:38, 12 September 2010 (UTC) | ||
| *'''comment''' there was a ] until a few months ago, but it was decided there's no need for two lists and it was merged into ]. I think that's best: one list where everything can be found rather than two you have to check, or even two and the identity you want is in the list you didn't check. I found it easily enough by typing "List of vec..." into the search box, so although it's not at the place I expected a redirect is there to make it easy to find. As the two identities on this page already appear at ] I think making this a redirect there makes sense; a merge except the content is already there.--<small>]</small><sup>]</sup><sub style="margin-left:-2.0ex;">]</sub> 18:40, 12 September 2010 (UTC) | *'''comment''' there was a ] until a few months ago, but it was decided there's no need for two lists and it was merged into ]. I think that's best: one list where everything can be found rather than two you have to check, or even two and the identity you want is in the list you didn't check. I found it easily enough by typing "List of vec..." into the search box, so although it's not at the place I expected a redirect is there to make it easy to find. As the two identities on this page already appear at ] I think making this a redirect there makes sense; a merge except the content is already there.--<small>]</small><sup>]</sup><sub style="margin-left:-2.0ex;">]</sub> 18:40, 12 September 2010 (UTC) | ||
| ::It seems to me awkward to place simple vector identities under the auspices of a more specific and complex subcategory that involves differential operators, namely ], especially when the simple identities do not depend in any way upon calculus or derivatives. Therefore, the sensible course is to have a separate article. ] (]) 19:44, 12 September 2010 (UTC). | |||
Revision as of 19:44, 12 September 2010
Vector quadruple product
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Seems to be a neologism. Does not appear in the source (though I could only search it in snippet view) and the Mathworld link where it looks like the name comes from has the name as Lagrange's identity, and that article is a list of identities related only by being products of four vectors. So is a separate article needed, should it be renamed to something more matching the sources; e.g. this gives it as "Lagrange's identity" (though we have such an article), or even to a more WP-ish "List of products of four vectors"? JohnBlackburnedeeds 14:45, 12 September 2010 (UTC)
- Delete. Article is a good as empty and the subject is hardly notable. Furthermore, according to sources (, , ) the product (AxB).(CxD) isn't even called a "Vector quadruple product" to begin with. DVdm (talk) 15:12, 12 September 2010 (UTC)
- Modify and rename, or merge. The product is indeed called the vector quadruple product here, although the name is poorly chosen as the result is a scalar, not a vector. As a scalar, a name preferable to vector quadruple product is quadruple scalar product. A more general result that includes this one is known as the Binet–Cauchy identity. The source cited by Wolfram does not appear to use the name vector quadruple product. The Wolfram article could be better named "vector identities using four vectors" or something similar, and this article would be more notable if it held a list of such identities for four vectors. I suspect that there is already an article that reviews such identities on WP, where this page could be merged. Brews ohare (talk) 16:44, 12 September 2010 (UTC)
- I'm unable to locate a page listing vector identities. Perhaps this page could be renamed and used to nucleate such a list? Brews ohare (talk) 17:06, 12 September 2010 (UTC)
- comment. From the history it looks like it was sourced from Wolfram's Mathworld, but though the article there is titled "Vector Quadruple Product" but it is a list of identities, not one: it starts "There are a number of algebraic identities involving sets of four vectors", so there is no product named "vector quadruple product" there. In any case Mathworld is a lot like Misplaced Pages, so is more a tertiary source than a secondary source and I would always look for other sources as well, and prefer them if they are different from Mathworld. I did not think of this but: merge to where? We have a page Vector calculus identities, a redirect from List of vector identities which already includes these two so there would be little or nothing to merge. while the more notable one is covered at Cross product and Binet–Cauchy identity already.--JohnBlackburnedeeds 17:17, 12 September 2010 (UTC)
- Proposal: The subsection here of Vector calculus identities is not appropriate as it doesn't refer to calculus per se. Also, the Binet–Cauchy identity article is a generalization of the quadruple scalar product. Perhaps this article can be renamed as List of vector identities and this subsection moved over? A number of other identities can be added, as per the Wolfram article, and some triple vector product identities added? Brews ohare (talk) 18:22, 12 September 2010 (UTC)
- Here's a beginning. Brews ohare (talk) 18:38, 12 September 2010 (UTC)
- comment there was a List of vector identities until a few months ago, but it was decided there's no need for two lists and it was merged into Vector calculus identities. I think that's best: one list where everything can be found rather than two you have to check, or even two and the identity you want is in the list you didn't check. I found it easily enough by typing "List of vec..." into the search box, so although it's not at the place I expected a redirect is there to make it easy to find. As the two identities on this page already appear at Vector calculus identities I think making this a redirect there makes sense; a merge except the content is already there.--JohnBlackburnedeeds 18:40, 12 September 2010 (UTC)
- It seems to me awkward to place simple vector identities under the auspices of a more specific and complex subcategory that involves differential operators, namely Vector calculus identities, especially when the simple identities do not depend in any way upon calculus or derivatives. Therefore, the sensible course is to have a separate article. Brews ohare (talk) 19:44, 12 September 2010 (UTC).