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Search: Posts Made By: CRGreathouse
Forum: Lounge 2020-04-01, 03:20
Replies: 19
Views: 481
Posted By CRGreathouse
They're all nearly identical. It has a repair...

They're all nearly identical. It has a repair mechanism; it doesn't act like a typical RNA virus.
Forum: Lounge 2020-03-29, 01:57
Replies: 19
Views: 481
Posted By CRGreathouse
I like to think of this as a game: suppose you...

I like to think of this as a game: suppose you step into an elevator and you find yourself sharing it with the commissioner of health of New York (the current epicenter of the outbreak). You have...
Forum: Lounge 2020-03-29, 01:46
Replies: 459
Views: 15,507
Posted By CRGreathouse
The study that this is based on is flawed and...

The study that this is based on is flawed and should be withdrawn. There are very few mutations in COVID-19, its repair mechanism (similar to the one in MERS and SARS-CoV-1...
Forum: Lounge 2020-03-29, 01:40
Replies: 459
Views: 15,507
Posted By CRGreathouse
I lived just off RAF Brawdy for several years,...

I lived just off RAF Brawdy for several years, not sure if 911 worked there though. (Military brat)
Forum: Lounge 2020-03-29, 01:36
Replies: 19
Views: 481
Posted By CRGreathouse
This would seem to require an infeasible amount...

This would seem to require an infeasible amount of labor to implement. And what, exactly, are you doing to moved people? Are you renting a hotel room for them?
Forum: Soap Box 2020-03-23, 16:54
Replies: 18
Views: 995
Posted By CRGreathouse
Population growth + no stay-at-home orders?

Population growth + no stay-at-home orders?
Forum: PARI/GP 2020-03-23, 05:50
Replies: 2
Views: 543
Posted By CRGreathouse
The documentation is here: ...

The documentation is here:
https://cypari2.readthedocs.io/en/latest/index.html

It definitely has lots of elliptic curve material. Whether it has what you're looking for or not, I can't say.
Forum: Lounge 2020-03-23, 05:11
Replies: 459
Views: 15,507
Posted By CRGreathouse
Yes. :furious: Kick 'em all out!

Yes. :furious: Kick 'em all out!
Forum: Lounge 2020-03-23, 05:09
Replies: 459
Views: 15,507
Posted By CRGreathouse
NY has the best testing in the US. But NY also...

NY has the best testing in the US. But NY also has two of the hardest-hit places in the nation -- NYC and Westchester.
Forum: Lounge 2020-03-23, 05:01
Replies: 459
Views: 15,507
Posted By CRGreathouse
The problem with test kits was that the CDC...

The problem with test kits was that the CDC messed up the first generation and prohibited state labs (and others) from using theirs. There's no lack of reagents anywhere I know of; the problem is...
Forum: enzocreti 2020-03-23, 03:03
Replies: 6
Views: 288
Posted By CRGreathouse
Cool Ah! of course. So it suffices to show 10^1 =...

Ah! of course. So it suffices to show
10^1 = 1^3 + 2^3 + 1^2
10^2 = 3^3 + 4^3 + 3^2
10^3 = 6^3 + 7^3 + 21^2
10^4 = 4^3 + 15^3 + 81^2
10^6 = 7^3 + 26^3 + 991^2
10^11 = 234^3 + 418^3 + 316092^2...
Forum: PARI/GP 2020-03-22, 05:43
Replies: 4
Views: 169
Posted By CRGreathouse
This is not a simple question to answer for PARI...

This is not a simple question to answer for PARI in general (you get into issues of the stack and universal objects). But for what you are doing, the correct PARI code, I believe, is
...
Forum: enzocreti 2020-03-22, 04:46
Replies: 6
Views: 288
Posted By CRGreathouse
It seems rather difficult to find positive...

It seems rather difficult to find positive integers n such that there are no positive integers a, b, and c with 10^n = a^3 + b^3 + c^2. n = 5 is an example, but there are no others up to 18.

I...
Forum: PARI/GP 2020-03-22, 02:45
Replies: 4
Views: 169
Posted By CRGreathouse
You can get the files from version control...

You can get the files from version control (https://pari.math.u-bordeaux.fr/git.html). Many of the functions, for example, are in src/basemath/elliptic.c...
Forum: Lounge 2020-03-21, 19:24
Replies: 459
Views: 15,507
Posted By CRGreathouse
-- Sen. Ron Johnson (R-Wis.), chairman of the...

-- Sen. Ron Johnson (R-Wis.), chairman of the Senate Homeland Security and Governmental Affairs Committee[/QUOTE]

That's horrifying.
Forum: PARI/GP 2020-03-21, 15:32
Replies: 32
Views: 800
Posted By CRGreathouse
Yes! If you can factor the resulting leading and...

Yes! If you can factor the resulting leading and constant terms, you'll be essentially done.



Newer versions also have polrootsreal() which return only those roots which are (exactly) real.

...
Forum: Lounge 2020-03-21, 04:49
Replies: 459
Views: 15,507
Posted By CRGreathouse
I prefer to let the American economy focus on...

I prefer to let the American economy focus on where it is efficient, and to let other economies focus on where they are efficient.

China has a fantastic model of gearing an entire town to the...
Forum: Lounge 2020-03-21, 02:45
Replies: 459
Views: 15,507
Posted By CRGreathouse
Yawn. Either we could have been inefficiently...

Yawn. Either we could have been inefficiently producing them all along, or we could have just buffered our own supply (https://www.phe.gov/about/sns/Pages/default.aspx) and price-signaled that we...
Forum: Lounge 2020-03-21, 01:12
Replies: 459
Views: 15,507
Posted By CRGreathouse
You could take a uniform random sample from the...

You could take a uniform random sample from the US at large (ordinary random sampling) and that would at least tell you the overall level of infection. If tests were really hard to come by you could...
Forum: PARI/GP 2020-03-20, 20:09
Replies: 32
Views: 800
Posted By CRGreathouse
Oh of course, silly me. So 'all' that's...

Oh of course, silly me.

So 'all' that's needed is to factor some megabit numbers and test them in a polynomial.
Forum: PARI/GP 2020-03-20, 15:08
Replies: 32
Views: 800
Posted By CRGreathouse
There's a closed algebraic form for the solutions...

There's a closed algebraic form for the solutions of a quartic, so you can just substitute away and be done. The solutions mightl be, say, 20 MB each before simplification, but that shouldn't be a...
Forum: Lounge 2020-03-20, 15:03
Replies: 459
Views: 15,507
Posted By CRGreathouse
You can get a decent idea with stratified random...

You can get a decent idea with stratified random sampling, but we don't even have enough tests for that right now. It would be very useful, though, because it would give an idea of the level of...
Forum: Lounge 2020-03-18, 02:43
Replies: 459
Views: 15,507
Posted By CRGreathouse
I concur with ewmayer's analysis, with a slight...

I concur with ewmayer's analysis, with a slight caveat: coronaviruses have a repair mechanism (https://www.pnas.org/content/115/2/E162) that should make their error rate lower than you'd expect for...
Forum: Math 2020-03-18, 02:36
Replies: 21
Views: 1,834
Posted By CRGreathouse
Could I have a pointer to the poorly-written,...

Could I have a pointer to the poorly-written, other-than-trivial parts, please? :smile: I'd like to understand what he's trying to do but I've always had trouble making sense of it, and you seem to...
Forum: Lounge 2020-03-16, 04:48
Replies: 459
Views: 15,507
Posted By CRGreathouse
My state's health department will have many...

My state's health department will have many people missing this week because the school system has just closed. Everyone is frantic; they're looking for a way to get them back because they already...
Showing results 1 to 25 of 1000

 
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