graycat

140 ms·

961.
by graycat 6y ago
Good questions. For > Before you can even do a keyword search, you obviously need an intent to do so. But that means keyword search is pretty useless when you don't know what you don't know. Right: The way at times in the past
962.
by graycat 6y ago
I have a list of 100+ candidates but (i) I have not selected one yet, (ii) don't really need one before I register it, and (iii) don't want to start paying for it before I need it. But thanks for your interest.
963.
by graycat 6y ago
For > Ask HN: Is there a search engine which excludes the world's biggest websites? > Discovering unknown paths of the web seems almost impossible with google et al.. > Are there any earch engines which exclude or at least pe
964.
by graycat 6y ago
Here is some reasoning for funding -- i.e., US Congress funding -- high energy physics (HEP), e.g., the Large Hadron Collider (LHC), I didn't see mentioned here: (1) The Russians, EU, China, Japan might pursue HEP so the US does not w
965.
by graycat 6y ago
The fast Fourier transform and related topics in stochastic processes.
966.
by graycat 6y ago
> For most every workload I can think of, as their load increases it's always one resource in particular that's the limiting factor. So this is a rediscovery , at least an example, of what could be called the bottleneck prin
967.
by graycat 6y ago
For that music, I like Maurice Gendron and Pierre Fornier. Thanks for Idagio -- first I've heard of it -- I made a note!
968.
by graycat 6y ago
For regular tires, it's been so long I don't remember in detail. When I was growing up, 13,000 miles on a set of tires was about all we got. The deal now, and for at least 20 years, is better rubber compounds for the tread, mesh u
969.
by graycat 6y ago
A view of technology : Watch an old movie and notice the many improvements in economic productivity, standard of living, quality of life. E.g.: To get salt, had to travel to the local village. For this had to saddle up or harness a horse
970.
by graycat 6y ago
After contacting many VCs and getting only meager responses, I concluded much the same things as in the OP. The VC Web sites were deceptive: They claimed interest in new, advanced, powerful, for big markets, secret sauce, barriers to entry
971.
by graycat 7y ago
> You're saying that we should assume "normal situation" in the face of evidence that your assumptions do not hold. Not really! As you say, this virus is new. Soooooo, we are short on info. So, we should entertain sever
972.
by graycat 7y ago
Some quite careful math for Fourier series is in Rudin, Principles of Mathematical Analysis . Fourier series applies to a function on the whole real line that is periodic , that is, repeats exactly once each some number of seconds. For
973.
by graycat 7y ago
I have two quite bright nieces. When I was explaining the equivalence principle to them, right away they saw that in the gravitational field of the earth there would be tidal effects and in free space with just acceleration, none. I had t
974.
by graycat 7y ago
> Only, there's no evidence that folks who recover from COVID are immune. Yup. But the usual assumption, experience, history, situation, whatever of viruses is that recovery means immunity at least for some significant time, say,
975.
by graycat 7y ago
> Combined with a long transmissable dwell time before symptoms, wouldn't surprise me if 90%+ of the people in NYC were materially exposed. Looks like you have a possibly important point: If so, then they would be well on the way to
976.
by graycat 7y ago
Sounds like the next step up would be stochastic optimal control, the field of my Ph.D. dissertation. Ah, been there, done that, got the T-shirt, and doing other things now!
977.
by graycat 7y ago
Nice reference. The discussion is mostly about SIR (for susceptible, infected and recovered) models but also with several generalizations to handle more details, e.g., losing immunity and getting infected again. A lot of this material
978.
by graycat 7y ago
Yes, as in the OP, S curves can be challenging to work with, in particular, to use, say, early in the history of smart phones, to make long term projections from the number of smart phones sold each day for each of the last 30 days. But the
979.
by graycat 7y ago
Deleted.
980.
by graycat 7y ago
Deleted
981.
by graycat 7y ago
> You can't have half person infected. At some point, everyone is infected and no new person will be infected. Yes, of course. We all know that. Can say the same thing for a lot of mathematical physics and other applied math. E.g.
982.
by graycat 7y ago
Yes, the logistic curves are lazy S curves and approach a limit asymptotically from below. Here's the calculus: At FedEx, the BoD wanted some revenue projections. We knew (1) the current revenue and (2) the revenue for serving all
983.
by graycat 7y ago
> But lockdown still requires to build herd immunity, we are only slowing it down. So the same number of people will get infected ultimately. Yes. I've been saying that, too. So, in blunt terms, currently we are trying to keep peop
984.
by graycat 7y ago
Right, e.g., follows the (a) logistic curve.
985.
by graycat 7y ago
> becomes non exponential at some point From some simple calculus, becomes the (a) logistic curve.
986.
by graycat 7y ago
Thanks. > Did you have more specific questions in mind? On stack overflow, my understanding was that could encounter that fatal condition from suddenly a too deep call stack , that is, too many calls without a return. So, if the "
987.
by graycat 7y ago
(1) Explain just how malloc() and free() work under the covers and the implications for multi-threading, memory leaks , virtual memory paging, etc. Maybe also cover some means, algorithms, and code for reporting on the state , status, e
988.
by graycat 7y ago
The situation sounds similar to ones years ago for statistics, operations research, optimization, and management science. I view all of such work as applied math. My experience is that applied math, from the fields I mentioned and some more
989.
by graycat 7y ago
Been eating cheap from before the COVID-9 pandemic. Here I will contribute two recipes: (1) Pizza. This pizza is good on cost and preparation time, okay to good on nutrition (I'm thinking mostly of calories), and, IMHO, flavor. Can ma
990.
by graycat 7y ago
Teaching of writing has long been mostly about teaching how to write belle lettre . Some of the lessons there can also apply to technical writing, e.g., have in mind and track the reactions of the intended audience. E.g., the script wri

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