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Search: Posts Made By: Dr Sardonicus
Forum: Lounge 2020-09-24, 00:31
Replies: 1,492
RIP
Views: 97,669
Posted By Dr Sardonicus
Gale Sayers...

Gale Sayers (https://www.chicagotribune.com/sports/bears/ct-gale-sayers-chicago-bears-died-20200923-4lv2wfxcangajgbcaiyiwbcnna-story.html)
Forum: Miscellaneous Math 2020-09-23, 12:04
Replies: 43
Views: 1,410
Posted By Dr Sardonicus
Of course it's a pseudoprime test. It involves a...

Of course it's a pseudoprime test. It involves a 2x2 matrix A, which has characteristic polynomial x^2 - (u+1)*x + u-1. The "if p is prime" results are easily proven using this polynomial, without...
Forum: Soap Box 2020-09-22, 12:43
Replies: 30
Views: 1,151
Posted By Dr Sardonicus
In the here and now, I am more concerned about...

In the here and now, I am more concerned about street thugs, under color of "exercising their Second Amendment rights," threatening and intimidating, or trying to intimidate, their fellow-citizens,...
Forum: Soap Box 2020-09-22, 11:26
Replies: 699
Views: 33,159
Posted By Dr Sardonicus
I noticed the following (my emphasis) in a Faux...

I noticed the following (my emphasis) in a Faux News report (https://www.foxnews.com/us/12-year-old-suspended-after-teacher-spots-toy-gun-during-virtual-class):I'm sure the young man's skin color had...
Forum: Lounge 2020-09-21, 00:55
Replies: 43
Views: 1,810
Posted By Dr Sardonicus
This is the first Monarch chrysalis I have ever...

This is the first Monarch chrysalis I have ever seen with my own eyes. It is hanging below a milkweed leaf over the deck of my front porch. Sorry for the poor image quality, I snapped it with my...
Forum: Alberico Lepore 2020-09-20, 11:52
Replies: 22
Views: 1,091
Posted By Dr Sardonicus
I am brought to mind of the following: --...

I am brought to mind of the following:

-- from Chapter 5 of Gulliver's Travels by Jonathan Swift

But an infinity of nonsense! You've got the Professor at the grand Academy of Lagado beat, hands...
Forum: Lounge 2020-09-20, 00:38
Replies: 19
Views: 1,048
Posted By Dr Sardonicus
...And it is still going strong with 2 forum...

...And it is still going strong with 2 forum members as of today.[/QUOTE]Still the same today and only 1 has ever posted.[/QUOTE]
Just out of curiosity as to whether I could still navigate there, I...
Forum: Lounge 2020-09-19, 13:11
Replies: 1,492
RIP
Views: 97,669
Posted By Dr Sardonicus
That won't take long, did it? McConnell has...

That won't take long, did it? McConnell has already promised a quick vote on whomever Il Duce appoints.

I have sometimes said, during the last four years, that the US died on November 8, 2016 --...
Forum: Miscellaneous Math 2020-09-19, 12:19
Replies: 43
Views: 1,410
Posted By Dr Sardonicus
Here is one proof that b(u) == b(p-u+2) (mod p)...

Here is one proof that b(u) == b(p-u+2) (mod p) if p is prime.

The characteristic polynomial x^2 - (u+1)*x + u-1 of the matrix A has discriminant Δ = (u-1)^2 + 4, which is invariant under the...
Forum: Miscellaneous Math 2020-09-18, 12:12
Replies: 8
Views: 319
Posted By Dr Sardonicus
About the small sample size, me three. ...

About the small sample size, me three.

Benford's law is based on the theorem that, if α is a (positive) real irrational number, the fractional parts of α, 2*α, 3*α, etc are uniformly distributed...
Forum: Lounge 2020-09-17, 13:50
Replies: 43
Views: 1,810
Posted By Dr Sardonicus
The REAL plant experts

I'm generally fairly good -- at least, for a layman -- at plant ID's. With common weeds or garden plants, I can often get the genus right, even if I can't name the species.

But I have just been...
Forum: Miscellaneous Math 2020-09-17, 13:17
Replies: 23
Views: 3,591
Posted By Dr Sardonicus
General guidelines have already been supplied...

General guidelines have already been supplied here (https://www.mersenneforum.org/showpost.php?p=557143&postcount=23). Heed them.

For information more specific to a given subforum, click on that...
Forum: Miscellaneous Math 2020-09-17, 12:47
Replies: 43
Views: 1,410
Posted By Dr Sardonicus
Regarding the use of polynomial coefficients to...

Regarding the use of polynomial coefficients to prove primality, there is already a well-known deterministic test, the AKS primality test. See the following 2004 paper...
Forum: Soap Box 2020-09-16, 14:09
Replies: 36
Views: 1,499
Posted By Dr Sardonicus
Sounds good! Oh, wait. Allow the medical...

Sounds good!

Oh, wait. Allow the medical system to grow naturally? The AMA is calling on Line Two....
Forum: Miscellaneous Math 2020-09-16, 13:56
Replies: 43
Views: 1,410
Posted By Dr Sardonicus
No. This isn't what your paper says (it does...

No. This isn't what your paper says (it does give a result about the off-diagonal entry of Ap however). The trace polynomials are monic, with constant terms given by Lucas numbers. For prime...
Forum: Soap Box 2020-09-16, 01:06
Replies: 36
Views: 1,499
Posted By Dr Sardonicus
I assume you served in Vietnam. I assume you...

I assume you served in Vietnam. I assume you were not a policy maker.

I suppose you could have chosen to write yourself a ticket to Leavenworth by refusing to be drafted, or gotten an...
Forum: Lounge 2020-09-15, 15:36
Replies: 1,071
Views: 46,641
Posted By Dr Sardonicus
Well, as long as it's mostly old people, who...

Well, as long as it's mostly old people, who cares? Their lives obviously aren't sacred.

I think it was one of the "Feiffer's fables" cartoons back in the day, with the conclusion, "The pre-born...
Forum: Lounge 2020-09-15, 12:24
Replies: 1,071
Views: 46,641
Posted By Dr Sardonicus
:tantrum: Just a pedantic nitpick, perhaps,...

:tantrum:

Just a pedantic nitpick, perhaps, but what you describe is not a Hobson's choice. I think it is more properly described as a dilemma.

A Hobson's choice is a "take it or leave it"...
Forum: Lounge 2020-09-15, 12:13
Replies: 1,071
Views: 46,641
Posted By Dr Sardonicus
I would point out that this also ascribes...

I would point out that this also ascribes motives. That is worrisome enough.

But it also dismisses out of hand the idea that the "lockdown" measures were put in place and remain in place because...
Forum: Lounge 2020-09-15, 11:27
Replies: 43
Views: 1,810
Posted By Dr Sardonicus
Nice shot. Looks like a Southern species of...

Nice shot.

Looks like a Southern species of walkingstick (Anisomorpha). Similar picture at Bugguide here (https://bugguide.net/node/view/1705880/bgimage).

Some insects fly around while they're...
Forum: Lounge 2020-09-14, 13:55
Replies: 1,002
Views: 43,287
Posted By Dr Sardonicus
I don't have a problem with that. Energy has...

I don't have a problem with that. Energy has mass. Of course, the energy that goes into the capacitor or into heating something has to come out of something else, and that something else will...
Forum: Hardware 2020-09-14, 13:23
Replies: 9
Views: 485
Posted By Dr Sardonicus
Looks like it's a done deal. ARM: UK-based...

Looks like it's a done deal.

ARM: UK-based chip designer sold to US firm Nvidia (https://www.bbc.co.uk/news/technology-54142567)
Forum: Miscellaneous Math 2020-09-14, 13:16
Replies: 9
Views: 386
Posted By Dr Sardonicus
If p is prime then 2p - 2 is divisible by 2p. So...

If p is prime then 2p - 2 is divisible by 2p. So if q divides 2p - 1, gcd(q-1, 2p - 2) is divisible by 2p.

However, 2n - 2 is divisible by 2 but not by 4 if n > 1. If p is prime and the...
Forum: Soap Box 2020-09-14, 12:51
Replies: 36
Views: 1,499
Posted By Dr Sardonicus
Yes, it's almost certainly true that just about...

Yes, it's almost certainly true that just about all the folks who worship are in thrall to support the incumbent are immune to argumentation. And I doubt many people who can't stand the incumbent...
Forum: Soap Box 2020-09-13, 13:51
Replies: 36
Views: 1,499
Posted By Dr Sardonicus
2 California deputies shot in apparent ambush in...

2 California deputies shot in apparent ambush in patrol car (https://apnews.com/ef8c6c26b42c53d092645bb054060379)If these "protesters" want the current occupant of the White House re-elected, they...
Showing results 1 to 25 of 1000

 
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