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5:48 AM
I have added the feed for Tag management 2021.
Q: Tag management 2021

José Carlos SantosNew year, new tag management thread. Rules of the game are basically the same: Post your suggestion as an answer here if you see A particularly bad tag (a rule of thumb: “if I can't imagine a person classifying a tag as either interesting or ignored, I'm getting rid of it”), A tag that should b...

6:11 AM
A: Tag management 2021

J. W. Tanner$\textbf{Proposal}:\;$ Create the tag Dot-product There is a tag for cross-product, but not one for dot-product. There is a tag for inner-product-space, but that is more abstract than the usual dot product for $\mathbb R^n$.

A: Tag management 2021

Don Thousand Resolved: Both tags renamed. Proposal: Rename matrixpencil to matrix-pencil, lyndonwords to lyndon-words Nothing too crazy here, just some quick grammar fixes.

6:32 AM
The above queries returned only one post where the tag was added (and then removed) back in 2013: math.stackexchange.com/posts/331604/revisions
Are there really enough (unique) good questions about the dot product to justify a tag for it? — Alexander Gruber ♦ 5 hours ago
I could imagine questions asking about why dot product equals area, such as:
There are some identities which deal with bot and dot product: math.stackexchange.com/…
The tag would probably fit here:
Maybe also questions like this:
Some other examples
In the above question, the OP asked: "Why is dot product not a tag?"
@AlexanderGruber I have added a few random examples in the tagging chatroom. Maybe somebody is able to find more of them - and looking at some of those question might help in deciding whether a separate tag for dot product would be suitable. — Martin Sleziak 10 secs ago
Of course, if somebody posts some other messages related to this tag here in chat, I will add them to the bookmarked conversation.
7:15 AM
In mathematics, the dot product or scalar product is an algebraic operation that takes two equal-length sequences of numbers (usually coordinate vectors), and returns a single number. In Euclidean geometry, the dot product of the Cartesian coordinates of two vectors is widely used. It is often called "the" inner product (or rarely projection product) of Euclidean space, even though it is not the only inner product that can be defined on Euclidean space (see Inner product space for more). Algebraically, the dot product is the sum of the products of the corresponding entries of the two sequences...
I have added the WP link just to have quick access to it from chat - maybe browsing through that article might give somebody an idea about some questions on this topic.
6 hours later…
12:55 PM
As a the dot product is a special case of an inner product, I am disinclined to have a tag.
However, I am more than happy to add language to the tag description which discusses the dot product, then making the tag a synonym.
1:18 PM
I just made some edits to the tag, in anticipation of creating a synonym. I am going to hold off on the synonym until there is more feedback. I would also appreciate feedback on the tag wiki edits.
4 hours later…
5:08 PM
@MartinSleziak The tag was removed there: math.stackexchange.com/posts/3971935/revisions But two other questions with this tag appeard in the meantime.
Q: A Urysohn Function on an Uncountable Fort Space

Carlos CabreraI'm struggling with a problem about determining if an Uncountable Fort Space is Tychonoff or not, at this moment I have proven that my space is regular Hausdorff but I can't find a Urysohn Function for the space in question. Any hint or tip is welcome :)

Q: Suppose that X is a compact Hausdorff space. Show that if A ⊆ X is compact, then A is closed in X.

bernard salamehSuppose that X is a compact Hausdorff space. Show that if A ⊆ X is compact, then A is closed in X.

1 hour later…
6:41 PM
When I looked at the above question, I noticed that this one did not have tag: How to prove that a compact set in a Hausdorff topological space is closed? I have added also , although in that case I was less sure whether it is needed there. (But the Hausdorff condition is important here, so probably yes.)
Q: How to prove that a compact set in a Hausdorff topological space is closed?

Elias CostaHow to prove that a compact set $K$ in a Hausdorff topological space $\mathbb{X}$ is closed? I seek a proof that is as self contained as possible. Thank you.


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