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dubya

532 karma · joined September 21, 2011

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dubya··on Sophisticated sudokus as playful proof practice
My kids and I worked through most of "The puzzle ninjas" by Alex Bellos, and some of the "Pencil puzzles" books from Nikoli. Working on them with others, it's a lot of making little conjectures, testing (proving) the conjectures, and then applying them to various parts of the puzzles. Occasionally we've even used the fact that there is a unique solution to eliminate various possibilities.

They provide a bit of the satisfaction that finishing a good graduate math course homework set does.

dubya··on The biggest project in modern mathematics [video]
May I recommend https://sites.psu.edu/ehssan/wp-content/uploads/sites/7257/2..., a transcript of a 2000 talk by Michael Atiyah?

A tiny bit from section 9:

> The 20th century can be divided roughly into two halves. I would think the first half has been dominated by what I call the "era of specialization," the era in which Hilbert's approach, of trying to formalize things and define them carefully and then follow through on what you can do in each field, was very influential. As I said, Bourbaki's name is associated with this trend, where people focused attention on what you could get within particular algebraic or other systems at a given time. The second half of the 20th century has been much more what I would call the "era of unification", where borders are crossed, techniques have been moved from one field into the other, and things have become hybridized to an enormous extent. I think this is an oversimplification, but I think it does briefly summarize some of the aspects that you can see in 20th-century mathematics.

dubya··on Apple employees criticize work-from-home policy in open letter
I wonder how many marriages have been saved by an open letter.
dubya··on Xfig
SVG wasn't an option at the time. Now, support for TeX labels might still be an advantage. These days I just use PGF/TikZ.
dubya··on Xfig
The simple text format also makes it somewhat scriptable, so you could make more complex figures than you could make with a mouse, without learning Postscript.
dubya··on Physics in a diverse world, or a spherical cow model of physics talent
Could you point out your or some of the other places that have a good model for DEI? My department has been struggling with this and will be redoing their mentorship program in the near future.
dubya··on Why won’t anyone teach me math?
State universities kind of do have this responsibility. My school is doing more or less this, restructuring some of the math sequences that have a high failure rate, like precalc/calc 1.

Also state universities are where most of the public school teachers and administrators trained, so they probably deserve a little of the blame for the state of public schools.

dubya··on More Americans are saying they’re ‘vaxxed and done’
> Just call up your local-clinic and ask them for a flu-shot. Stand in line for 4-hours for things _COMPLETELY_ unrelated to COVID19, and come back and tell me that its fake.

Note that this varies by where you are. Locally, there is no health care crunch: it's easy to get a flu shot or other vaccine with no wait, and ICUs still have capacity despite a huge increase in cases. We're probably screwed in a few weeks since there's only about a 60% vaccination rate here and the most recent surge didn't start until maybe two weeks ago.

dubya··on Winnie the Pooh to Enter the Public Domain in 2022
May I recommend the audiobook version with Stephen Fry as Pooh, and an ensemble of other very talented actors? It's on Audible but your local library may have it on CD. I've heard it dozens of times by now and look forward to hearing it again sometime.
dubya··on Japan's Paper Culture
I mostly agree. I use cheap paper at home, but my work recently switched suppliers and the new stuff is fine for printing, but bleeds terribly with liquid ink pens. Comes in plain white wrapper so I'm assuming it's pretty cheap.
dubya··on U.S. indicts two men for running a $20M YouTube content ID scam
Not exactly a new idea.

  They constantly try to escape 
  From the darkness outside and within 
  By dreaming of systems so perfect that no one will need to be good. 
T S Eliot, The Rock
dubya··on Lessons from a year of AI research
This seems really like a browser problem, and I'd love to know a fix. Geogebra.org hijacks CMD-` in Safari and it is absolutely infuriating.
dubya··on The CodeRibbon code editor plugin
Looks like it's being worked on, but has a big (NOT YET WORKING) disclaimer:

https://github.com/utk-se/VSCodeRibbon

dubya··on Ć Programming Language
On Mac, hold down the "c" key and a little menu with accented versions (ç, ć, č) appears, with numbers to choose which one. The flip side is that holding down letters or numbers doesn't repeat them on a Mac.
dubya··on Orion is a new WebKit-based browser for Mac
The adblocker Wipr has recently added something beyond the Content Blocker API with Wipr Extra. I only found it because I had forgotten to switch to AdGuard on my office Mac, and Wipr Extra showed up in an update. Lots of restrictions and caveats though about what it can and can't do. Some details at

https://giorgiocalderolla.com/wipr-faq.html#what-is-wipr-ext...

dubya··on Do not leave XPS laptop in any sleep/hibernate/standby mode when placed in a bag
I really miss the "snoring" light that Macbooks used to have, though more to tell if the computer is actually waking up.
dubya··on Chery QQ Ice Cream goes on sale in China – a modern electric car for $4,600
The Honda Fit is on its 4th generation and is still sold in the US. I think it's a hybrid now. Mine is a 2008.
dubya··on The Ethnocentric Origins of the Learning Style Idea
Non-paywalled version: https://journals.sagepub.com/stoken/default+domain/JUTBZVGAF...

found here (articles by author Thomas Fallace): https://muckrack.com/thomas-fallace/articles

dubya··on American parents are sending their kids to 'Russian math' (2017)
Not sure about youtube, but for the right age kid, maybe late-elementary to early high school, there's a weekly "Joyful math jamboree" online. The web page for it is not updated very often, but the registration form still works.

There's also the Julia Robinson Math Festival that's supposed to be good but I don't have first-hand experience.

Ideally, a Math Circle would could be good for some kids if your area supports one.

dubya··on Columbo: an origin story (2018)
I recommend the Maigret novels by Georges Simenon. He is portrayed as a genuinely decent human being, and the stories are interesting.
dubya··on For developers, Safari is crap and outdated
The link to your generic-c github project is broken.
dubya··on Game Theory Through Examples [pdf]
This is just an excerpt. The actual book seems to be out of print, but a pdf is easy to find, and it's on ProQuest if your library has access to that. Here's a review if you want a little more: https://www.maa.org/press/maa-reviews/game-theory-through-ex...
dubya··on WD My Book users wake up to find their data deleted
I doubt a fix is coming. Just keep it from reaching the Internet long enough to disable the cloud features. A patch cable directly to the PC should work.
dubya··on WD My Book users wake up to find their data deleted
Mine is still prompting me to register my device. It's been a secondary Time Machine backup for 10+(?) years, but really is too slow to ever do a restore from. This is a good reminder to replace it.
dubya··on A good livestreaming setup is a well-tailored suit
Most of the web works fine with a fast link _to_ your home, so that's what Comcast et al have optimized for. I had to upgrade during Covid to get a decent upload rate. Speedtest says I now have 238Mbps down/12Mbps up. For comparison my office has 100Mbps up and down and has never felt slow for downloads.
dubya··on novelWriter – open-source plain text editor designed for writing novels
This illustrates what I miss using WYSIWYG programs like MS Word or Google Docs: the ability to easily comment out lines without deleting them, or leave notes to oneself.
dubya··on The art of solving problems with Monte Carlo simulations
Nice fact! How about this for a proof: Let X_j be a sequence for unif(0,1) random variables, S_n the sequence of partial sums (so S_4=X_1+X_2+X_3+X_4).

If N is the number of uniforms needed to have a sum bigger than 1, you can see that P(N>n)=P(S_n<1).

P(S_n<1) is not too bad to compute, or you can wikipedia it (Irwin-Hall distribution) to find the expression P(S_n<1)=1/n!

Combining the things, E[N]=sum(P(N>n),n=0..infinity)=sum(1/n!,n=0..infinity)=exp(1).

dubya··on Each Decade That Passes, Fewer People Report Knowing How to Drive Stick Shifts
What do people do about long hills and mountains in an automatic? I've not driven an automatic that doesn't have a manual mode in mountains. Maybe it's not that big a deal to ride the brakes the whole way down? Do modern CVTs have some sort of manual override?
dubya··on Spy pixels in emails 'have become endemic'
I think it used to be more prominent on gmail. Now it's a little link next to the name of the sender at the very top when the email is opened. But not all list messages have it, and for some, gmail even hides the unsubscribe link below a [Message clipped] link to the full email.
dubya··on Teardown of the Apple's A1243 Keyboard
Yes, the short version. I didn't realize there was a full-size version or I'm sure I would have picked that when my Mac was replaced.
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