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Martin Sleziak

5:25 AM

in Homotopy Theory, 9 hours ago, by Joe Berner

@MartinSleziak I think algebraic-cycles could work, but it's wordier divisors is of special interest.

in Homotopy Theory, 8 hours ago, by Joe Berner

supposed to be "...it's wordier and divisors are of..."

Feeds

5:41 AM

-4

Q: How would you tag an MO question involving both Zumkeller numbers (A083207) and edge-magic injections (A152682)

Assume (just for the sake of discussion) that you had good reason to suspect the existence of some non-coincidental relationship underlying the fact that the triple 176, 240, 336: i) not only shows up as three Zumkeller numbers in A083207 ii) but also (when divided thru by 16) as 11,15,21 in A1...

10 hours later…

Martin Sleziak

3:58 PM

Eric Peterson asked in the other chatroom whether the mistake with divisors tag is frequent.

in Homotopy Theory, 29 mins ago, by Eric Peterson

@MartinSleziak is that a common point of confusion?

in Homotopy Theory, 17 mins ago, by Martin Sleziak

@EricPeterson It's not that easy to get hard data - we cannot be sure how many questions were originally tagged incorrectly and stayed tagged incorrectly for a long time before somebody corrected it.

in Homotopy Theory, 11 mins ago, by Martin Sleziak

This query might be - probably very approximate - attempt to get list questions which had this tag in the past: Posts which had given tag in the past.

in Homotopy Theory, 7 mins ago, by Martin Sleziak

Maybe this might give a bit clearer picture - if somebody corrects the tag and writes also the edit summary, it is very probably that the edit summary will include the word divisors. List of all edits where edit summary contains given keyword

Some mistagged question I was able to find:

Little problem of divisibility - corrected within few days by Gerry Myerson.

Cardinality of the prime divisor set of a k-power sum - corrected within few hours by Ricardo Andrade.

Numbers with all N-digit prefixes divisible by N - corrected within 24 hours by Ricardo Andrade.

Good books on the divisor sum function $\sigma(n)$? - corrected within 24 hours by me.

Divisibility criterion of binomial coefficients - corrected after two weeks by me.

Is $\sigma(n)$ has explicit compositional inverse formula since it has series representation? - corrected withing few hours by me.

Are there pairs of consecutive integers with the same sum of factors? - corrected after four years by quid.

Smallest integer not divisible by integers in a finite set - corrected after four years by quid.

What literature is known about MacMahon's generalized sum-of-divisors function? - corrected in 2014 by quid.

On Robin's criterion for RH - corrected in 2014 by quid.

Is it necessary that gcd > 1 of an infinite set? - corrected in 2014 by quid.

Finding primes using Euler's sum of divisors recurrence relation - corrected in 2014 by quid.

Maximal order of Hooley's Delta function? - corrected in 2014 by quid.

Getting a bound on the coefficients of the factor polynomial - corrected in 2014 by quid.

What are the divisors of $2n^2 - \sigma_{1}(n^2)$ for composite $n$? - corrected in 2014 by quid.

Are all known $k$-multiperfect numbers (for $k > 2$) not squarefree? - corrected in 2014 by quid.

Sum of divisor function over arithmetic progression - corrected in 2014 by quid.

Who is attributed with the conjecture that every multiply-perfect number greater than $1$ is even? - corrected in January 2014 by quid.

A question concerning the strange arithmetic derivation - corrected in January 2014 by quid.

Is there a fixed integer $x>1$ satisfing ${\sigma}^{k}(x)\equiv 0\pmod{x}$ for all positive integers $k$? - corrected within a week by Ricardo Andrade.

Is $\liminf \frac{\sigma_{k}(n)}{n}$ finite for every $k$? - corrected within few hours by Ricardo Andrade.

Are there infinitely many $k$ for which $\frac{\sigma(k)}{k}=n^p$ and $p$ is an odd prime? - corrected one day later by Ricardo Andrade.

And then there are the 7 questions linked above where the divisors tag is still used incorrectly.

However, as far as I can tell, the tag divisors-multiples was created in 2014. So several of those retags by quid were at the time when the new tag was created.

And it was in 2014 that tag-excerpt was edited to clarify usage.

Maybe oldtimers from MO remember whether before that that the tag was intended for both meanings.

in Homotopy Theory, 41 secs ago, by Martin Sleziak

@EricPeterson I will admit that there are not that many of them - however I tried to collect examples of posts that were originally tagged divisors and then corrected to divisors-multiples in another chatroom.

BTW the tag-excerpt for divisors-multiples was created in January 2014 - so I'd guess it was almost immediately after the tag was created.

It seems that the tag (divisors) was created by Ben Webster in October 2009: mathoverflow.net/posts/258/revisions and mathoverflow.net/posts/44/revisions

Judging by the topics he is interested in, he had most likely the meaning from algebraic geometry in mind.

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