kkylin

105 ms·

511.
by kkylin 10y ago
One of the consequences of relativistic QM, predicted to exist by Dirac: https://en.wikipedia.org/wiki/Positron#Theory
512.
by kkylin 10y ago
Probably no way to know if this critter is an ancestor of ours. Though I'm not a biologist, as far as I know the question you pose remains a mystery...
513.
by kkylin 10y ago
I presume that by "vertebraes" you mean "vertebrates"? All vertebrates are actually deuterostomes (see the Wikipedia page [1]), as are echinoderms (sea urchins, sea stars, etc). Insects, etc., are protostomes, meaning
514.
by kkylin 10y ago
Not sure this is what you meant by "blue collar," but I was just thinking this morning about driving by the NeXT logo in Fremont, the stretch of Mission connecting 680 to 880. I believe they actually built the cube there, but I c
515.
by kkylin 10y ago
South Bay has changed a lot too. Even when my family moved there in the late 70s / early 80s, there were still a few orchards left here and there. Almost all condos and town houses now. (Wish I have some pictures to share...)
516.
by kkylin 10y ago
I remember going to the Apple Store the week they released the 2014 Mac Mini, taking one look, and going back to my campus bookstore and buying the last of the 2012 Mac Minis. Still very happy with that purchase. Not sure about the rationa
517.
by kkylin 10y ago
Yes, I would agree with that!
518.
by kkylin 10y ago
As far as I know there is no analog of entanglement in these experiments. If someone has heard or read something in that regard, I'd be interested in a reference!
519.
by kkylin 10y ago
What I personally do not like about pilot wave theory is that in the many body versions of the theory that I've seen, you still need a wave function that depends on the positions of all the particles. That is, the "pilot wave&quo
520.
by kkylin 10y ago
I was and am a heavy Skim user ( http://skim-app.sourceforge.net/ ) -- on Macs, I've found it to be a quick and snappy alternative to Preview or Acrobat for reading and marking PDFs. 10.12 broke the UI for text annotati
521.
by kkylin 10y ago
The pressures are perhaps greater now than when Feynman started out in science, partly because so much of the academic career path is more rigid and formulaic than it used to be. Still, human nature being what it is, the temptation to cut
522.
by kkylin 10y ago
More or less my experience: Word 4 was snappy on my SE/30, had all the features you ever needed, and then some, and the interface didn't get in the way of anything. Now 95% of my tube time is in Emacs, and most things are written
523.
by kkylin 10y ago
Agreed! Word 4 on the Mac remains one of the nicest word processors I've used.
524.
by kkylin 10y ago
Agree with everything. I also want to point out that the final published version is not always better -- it represents compromises made with reviewers / editors to get papers through. Often these are positive, but not always. Someti
525.
by kkylin 10y ago
I haven't uploaded a paper in a while (coauthors have been doing it more recently), but I'm pretty sure it encourages uploading document sources somewhere during the process. The issue that sibrahim mentions, about stuff in comme
526.
by kkylin 10y ago
As I understand it, cheetahs are less genetically diverse than most big cats. (Sorry, can't recall where I originally heard about this; off-hand here is a non-technical reference: http://evolution.berkeley.edu/evolibra
527.
by kkylin 10y ago
Hey, I remember that! The NeOS demo at Macworld expo was indeed cool. Down to the ability to shut off the last CPU.
528.
by kkylin 10y ago
Ditto! My first machine was an Apple IIe, and my second a Mac SE/30. I've loved almost every Apple machine I've ever owned. The software, on the other hand, seems to get progressively worse. Not so bad to make me ditch Ma
529.
by kkylin 10y ago
And with practical applications as well: https://en.wikipedia.org/wiki/Positron_emission_tomography
530.
by kkylin 10y ago
I quite agree with millstone's comment below: interesting analogy, but not sure it is quite right here. And an off-topic, comment: I do agree with the sentiment that some things may be more easily expressed in nonstandard analysis. F
531.
by kkylin 10y ago
I don't think it is all that common in engineering programs here in the US, though not being an engineer myself, I am really speaking out of ignorance here. I don't know if there is something equivalent in the sciences -- there a
532.
by kkylin 10y ago
For background, I have a PhD in applied/computational math, and am working in academia, though at an earlier point in my life I did contemplate going into the (software) industry. For whatever it's worth, I'm mostly happy wit
533.
by kkylin 10y ago
I had a very similar experience with my PhD (also in applied mathematics), though my advisor basically let me pick my own problem to work on, which turns out to be a very tough thing to do.
534.
by kkylin 10y ago
I hadn't seen these before. They're great. Thanks!
535.
by kkylin 10y ago
Wow. This is cool. For anyone else who's interested, the full paper is at http://www.pnas.org/content/113/29/8206.full and supplemental information (including movies) at http://www.pnas.org&
536.
by kkylin 10y ago
I think what was fun about HyperCard was that it was not purely textual -- a lot of the work (and fun) in building a stack was graphical. AppleScript seems more like a traditional programming language, but with syntax I have a hard time re
537.
by kkylin 10y ago
The article didn't say, but off-hand I would guess it's for the same reason they crashed Galileo into Jupiter ( https://en.wikipedia.org/wiki/Galileo_(spacecraft) ), namely to avoid any possibility of contamina
538.
by kkylin 10y ago
And error measures involving sum of absolute values (i.e., L1 norm) are central to methods like lasso ( https://en.wikipedia.org/wiki/Lasso_(statistics) ) and their cousins.
539.
by kkylin 10y ago
Second that! Like many (almost all?) others, I find AppleScript the language really painful to use. As I recall HyperTalk was similarly laden with unnecessary syntactic sugar, but the HyperCard environment was so much fun to use that I re
540.
by kkylin 10y ago
Yes. Easiest example would be just the product of a_n, n=1,2,3,..., with a_n=same constant in (0,1). Then all the partial products will be positive, but the limit is clearly 0.

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