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7:22 AM

Here is an answer explaining the reduction from 250 to 150 characters. — Glorfindel Mar 29 at 19:59

A: Length limit for question titles that have nothing to do with Unicorns (we don't really need that many characters just for the title, do we? Isn't that what the question body is for? Some lower length limit would help here. Seriously.)

I'd need to analyze existing question title length to get a sense of what the maximum length should be. Suggestion of "one line". This of course varies per font and characters used, but for this post it is: Length limit for question titles that have nothing to do with Unicorns (we don’t reall...

Mar 19 at 23:37, by theHigherGeometer

@MartinSleziak No, I think the comments are fine. I'll add an answer summarising the information I've learned, at some point in the near future. Thanks for the help!

@theHigherGeometer ^ Just a reminder that you planned to post an answer there. (Of course, I understand that we all are busy also with stuff outside MO/SE. But still I have at least mentioned it - in case you've forgotten about that post.)

Q: Editing old question, can't submit as title is too long

I'm editing Is there a canonical map from the cohomology of orbifold Chiral de Rham on an orbifold to the cohomology of Chiral de Rham on a crepant resolution? as there was a broken arXiv Front link (and I took the opportunity to add some paper titles in). But I cannot submit the edit as the ques...

2 hours later…

Martin Sleziak

9:48 AM

A: How to prove: if $a,b \in \mathbb N$, then $a^{1/b}$ is an integer or an irrational number?

Below is a simple proof of irrationality of square-roots that I discovered as a teenager (inspired by a proof of Dedekind). It employs the Bezout identity for the gcd, i.e. $\rm\,\gcd(a,b)\,$ is an integral linear combination of the integers $\rm\,a,b,\,$ i.e. $\rm\,\gcd(a,b)\, =\, a d - b c\,$ f...

I see that originally the word elsewhere was a link to MathOverflow posts. But it was edited to another link - but this link now simply redirects to Classroom Resources on nctm.org. Some version is available in the Wayback Machine. — Martin Sleziak 1 min ago

dead-link Are all links to mathforum.org/kb dead now? The search returns 30 posts on MO and 124 posts on math.SE.

1 hour later…

Martin Sleziak

10:58 AM

@Martin Thanks for notifying me. I have updated the link to an answer here. — Bill Dubuque 14 mins ago

1 hour later…

Martin Sleziak

12:19 PM

@Glorfindel I guess you've made some adjustments to your script concerning the projecteuclid links?

Was this one done manually or by a script: cstheory.stackexchange.com/review/suggested-edits/28324 ? I see that in that edit, a link starting with projecteuclid.org/DPubS was replaced by a working link.

If it was done by the script, it is pretty impressive how fast you have modified it.

Glorfindel

Thanks :) Actually, that was a manual test of the updated script. I won't be automatically looking for other instances (like I did e.g. with some of the UCDavis links), since it looks like staff can do it without bumping.

Martin Sleziak

Still, as I said, I was a bit surprised to see that. (I don't write a lot of code. But in various things I wrote, there is a lot of things which would need update - but I am postponing that indefinitely.)

Glorfindel

You won't be when you see the actual change:

which is literally just adding the following to a configuration file:

{
		"urlPart": "projecteuclid\\.org/DPubS\\?(.*)&handle=([^&]*)",
		"status": "KNOWN_BROKEN",
		"replacements": [
			"projecteuclid.org/$4"
		]
	}

(and a test case for my collection of automated tests)

Martin Sleziak

Does projecteuclid.org/$4 mean replacing it with the part which matches ([^&]*)?

Glorfindel

yep

it's regex replacement, but $1 and $2 are outside the urlPart

The script does have more complicated transformations but luckily they weren't necessary

Martin Sleziak

12:29 PM

Nice, that should work also for the links which have something after the handle. For example, this link: http://projecteuclid.org/DPubS?verb=Display&version=1.0&service=UI&handle=euclid.jmsj/1225376618&page=record.

Glorfindel

indeed

I didn't know about those except by your helpful compilation of all the various forms

Martin Sleziak

I mostly use regular expressions when I work with sed. (Which is one of the tools i used when getting the list of projecteuclid links appearing on MO and math.SE.)

At some point I should try to get a list of links with projecteuclid.org/download. (And test whether they work or not in some way.)

Glorfindel

200

Q: What is meant by "Now you have two problems"?

There is a popular quote by Jamie Zawinski: Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems. How is this quote supposed to be understood?

regular-expressions

Martin Sleziak

But I suppose I'll do that when I have a bit more spare time.

Glorfindel

@MartinSleziak my script could do the testing and compile a list, if you don't find a pattern

of course, things like these are (almost) never worth hurrying

Martin Sleziak

12:33 PM

Well, I suppose all I need to do there is get the list of links. (The same thing I did here.)

And then rund wget on them - to see whether some of the links return errors.

Glorfindel

true, it can be done semi-automatically

Martin Sleziak

But I'll try to remember your offer - in case I run into some problems, I'll ask for help.

The quote you posted sounds really catchy - I should probably read that. :-)

Glorfindel

sure, you're always welcome

Martin Sleziak

I see that the top voted answer starts like this: "Some programming technologies are not generally well-understood by programmers (regular expressions, floating point, Perl, AWK, IoC... and others)."

I suppose I might be one of those people who do not understand those technologies well.

Glorfindel

me too

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