Tagging - 2016-10-21

2:40 AM

in Math Mods' Office, 9 hours ago, by Martin Sleziak

lcm was created recently: http://chat.stackexchange.com/transcript/3740/2016/10/17

in Math Mods' Office, 9 hours ago, by Martin Sleziak

Since it already exists, perhaps a reasonable thing to do would be make it a synonym of least-common-multiple. (So that the situation is similar as for greatest-common-divisor and gcd.)

in Math Mods' Office, 9 hours ago, by Martin Sleziak

If the mods agree that it is a reasonable suggestion, perhaps they could create a synonym. (I do not have sufficient reputation in (least-common-multiple) tag to suggest a synonym with this tag as the master tag.)

in Math Mods' Office, 4 hours ago, by Daniel Fischer

@MartinSleziak Synonymed and merged.

Martin Sleziak

3:57 AM

The basis tag was created again.

0

Q: how to find a basis of complementary subspace of a subspace

I have a $m$ dimensional subspace $V$ of $\mathbb{R}^n$, I know for another subspace $W$ for which $$V\oplus W=\mathbb{R}^n$$ Now basis of $V$ is given explicitly in a matrix $M$ whose $m$ collumns are linearly indipendent and play role as basis for $V$. My question is how I can find explicitly...

0

Q: subtraction of subspace?

Suppose I have two subspaces $V$ and $W$ of $\mathbb{R}^n$ such that for another subspace $X$ we have $(V\cap W)\oplus X=(V+W)$ How can I find a basis explicitly for $X$ when I know basis for $V,W,V\cap W,V+W$ explicitly? when $V,W$ is given, $V-W$ make sense?Like we know $V+W=\{x+y:x\in V, y\...

linear-algebra vector-spaces basis

This tag was discussed before and removed, wasn't it?

12

Q: Can we delete the [basis] tag?

The basis was recently created. But it's a horrible tag. There are different notions of basis in mathematics, and they are not entirely the same at all. Hamel basis Hilbert basis. Schauder basis. Topological basis. The tag is used as a free for all. And if it continues to exists, it will be u...

discussion tag-management tag-blacklist

4

A: Tag management 2015

Resolved The tag was removed. See also the separate post for this tag: Can we delete the [basis] tag? Do we really need basis? More specifically, there are different notions of basis in mathematics, and the tag is practically useless without adding a distinction between them.

@MartinSleziak Here is the screenshot (I guess it might eventually get removed).

I removed basis from the above two questions.

Martin Sleziak

5:02 AM

This user is clearly on the hunt for research assistant badge. Of course, there is nothing wrong with that if the edits he makes to the tag-wikis are improvements.

Oh, I see he already got the badge, less than an hour ago.

So perhaps this will slow down the large number of suggested edits to tag-wikis.

Asaf Karagila

5:19 AM

The same user has once joined a beta site, and literally voted all the posts just to get some badges.

Badge hunting is a terrible thing to do. Especially with the quality of edits that you have linked.

Martin Sleziak

@AsafKaragila What do you think about synonym suggestion I mentioned above?

13 hours ago, by Martin Sleziak

What do you think about the synonym binomial-theorem $\to$ binomial-coefficients which was recently suggest (it's another one by JonMark Perry.)

As I said above, my opinion is that it should be discussed on meta before suggesting the synonym. (Since this is big enough change - both tags are rather large.) But probably the person who is supposed to make the meta post about synonym should in general by the same user who suggests the synonym, not always one of several people who are active in "monitoring" tag-related issues.

@AsafKaragila I did not check all of his recent suggested edits. I have seen some that were good or at least reasonable. And creating tag-wikis or improving already existing ones is definitely good thing. But there were definitely several suggested edits where my impression was that the only purpose was to add something that could be edited in order to get closer to the badge.

Asaf Karagila

@MartinSleziak Yeah, well...

@MartinSleziak I largely agree with everything you've said in this message.

Martin Sleziak

I'd say that badge hunting can be both good or bad, depending how the user approaches it. Badges are generally created in such way that they reward activities beneficial to the site. So if I decide that I want some badge, but I only edit/vote/review etc. in such way that it is an improvement (i.e., my incentive is not only to get the badge, but also to make something useful for the site), then it is win-win situation.

I get the badge, some some useful stuff is done.

Asaf Karagila

Oh, I definitely agree that badge hunting can be done with mostly useful consequences. But some users have shown utter disregard to the consequences, and that makes it a dangerous thing.

Martin Sleziak

About the synonym, I will wait a bit, to see whether it gets enough downvotes to be removed. If not, I will make a post on meta about this specific tag synonym. (Probably in the tag-management thread - if we find out that there will be many comments and a separate thread is needed, it can be created later.)

Asaf Karagila

5:32 AM

Just look at the said user's vote record on our meta. Had cast 60 votes, received the Vox Populi badge, and that was over a year ago when the user was relatively new.

I'm not entirely sure how this user hasn't earned a network wide suspension, or at least a permanent suspension on more than a handful of websites.

Martin Sleziak

I vaguely recall seeing some comment (probably by a mod, I am not sure whether on main or on meta) saying something along the lines that: "Your tendency to go for badges have been noticed." Maybe even with link to some discussion on main meta or some link to chat room associated with main meta.

Asaf Karagila

This was in an answer by "Normal Human", with a link to the meta.SE post that I have mentioned. Oddly enough, the moderator who asked the question didn't bother to delete the account, or get the votes invalidated (as they are clearly in bad faith).

But we are veering off topic, and I have to go.

Martin Sleziak

I did not find that particular post on meta. But still aht off to your memory.

Too bad that NormalHuman deleted their account. It would makes some things easier if it would still be possible to search among his posts on meta.

*Typo: aht $\to$ hat

Ok, it was this one:

7

A: Flagging vs. close issue

As commenters said, reaching 3000 reputation does not preclude you from earning Marshal badge. You can still flag spam as spam, flag Very Low Quality posts as such, flag answers that should have been a comment as Not an Answer, and flag comments when there is a reasonable case for doing so. That...

Martin Sleziak

11:37 AM

specific-question When I thought about appropriate tags for this question:

0

Q: Show that for any natural numbers, if $S(x)=S(y)$ then $x=y$.

Definition. $0=\emptyset$. Definition. $S(x):=x\cup\{x\}$, $S(y):=y\cup\{y\}$. Show that for any natural numbers, if $S(x)=S(y)$ then $x=y$. We will use induction for proof but, how? Can you hint? Proof trying. Let $t\in x\cup\{x\}$. Then, $t\in y\cup\{y\}$ by the assumption. Now, we have to...

elementary-set-theory peano-axioms

I have added peano-axioms, since it is essentially about a model of Peano arithmetic.

However, I have also considered natural-numbers.

I will admit that tags such as natural-numbers, integers, rational-numbers, real-numbers have somewhat unclear usage and at least some of them have been discussed on meta a few times.

But at least one situation where I was quite confident I can use those tags was in the case of questions about constructions of various number sets. (E.g., construction of $\mathbb N$ in ZFC, or $\mathbb Q$ obtained from $\mathbb Z$ as quotient field, or $\mathbb R$ as Dedekind cuts or Cauchy completion,...)

That's why I wanted to use natural-numbers also here. But I was less confident about using this tag after I found out that it is synonym of elementary-number-theory.

Martin Sleziak

2:42 PM

Does exponents tag bring something which is not already covered by exponentiation?

Remove? Synonym? Or does it make sense to keep them separate for some reason?

BTW all 3 question currently having this tag are closed (or on hold):

-8

Q: The question is about exponents with linear equations

The Question confused everyone in my class If \begin{align} x^{{3a}^{bc}}={(x^b)^a}^c \end{align} and ($a,b,c$ not equal to $0$). Find 3abc-1/bc ^= to the power.

exponents

1

Q: Simple Laws of exponents - that aren't so simple

Evaluate $(b^2)^{\frac{1}{2}}$ for $b=-1$. If you substitute $b=-1$ first and then simplify you get $((-1)^2)^{\frac{1}{2}}=(1)^{\frac{1}{2}}=1$ but if you simplify first and then substitute you get $b^1=(-1)^1=-1$. What am I missing?

algebra-precalculus exponents

0

Q: How to do these type of exponential question?

$(x)^{{3a}^{bc}} = (x)^{{b}^{{a}^{c}}} $ , where (a,b,c are not equal to 0), then find the value of $(3a^{bc}-1)/bc$

exponential-function exponentiation exponents

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$Mathematics$ Tagging