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 Showing results 1 to 25 of 1000 Search took 0.30 seconds. Search: Posts Made By: Dr Sardonicus
 Forum: Lounge 2020-09-20, 00:38 Replies: 19 Views: 981 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: 1,490 Views: 97,364 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: 37 Views: 1,150 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: 7 Views: 234 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: 42 Views: 1,687 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: 24 Views: 3,547 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: 37 Views: 1,150 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: 29 Views: 1,324 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: 37 Views: 1,150 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: 29 Views: 1,324 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: 46,338 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: 46,338 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: 46,338 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: 42 Views: 1,687 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: 43,079 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: 468 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: 8 Views: 311 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: 29 Views: 1,324 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: 29 Views: 1,324 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...
 2020-09-13, 13:39 Replies: 2 Views: 2,962 Posted By Dr Sardonicus I'd been meaning to look at this for a while. I... I'd been meaning to look at this for a while. I finally got around to it. In the present situation, we want p and q = 2*k*p + 1 both to be prime. The Bateman-Horn Conjecture says there is a...
 Forum: Lounge 2020-09-12, 21:50 Replies: 1,490 Views: 97,364 Posted By Dr Sardonicus John Steed and and Emma Peel were such popular... John Steed and and Emma Peel were such popular characters, they were parodied in contemporary TV series. The episode "Run, Robot, Run" (first aired 16 March 1968) in Get Smart featured an obvious...
 Forum: Miscellaneous Math 2020-09-12, 21:33 Replies: 3 Views: 169 Posted By Dr Sardonicus I question the use of the term "conjecture,"... I question the use of the term "conjecture," which, as explained here (https://www.mersenneforum.org/showpost.php?p=554339&postcount=15), implies the statement is important and worthy of study. The...
 Forum: Miscellaneous Math 2020-09-12, 20:05 Replies: 37 Views: 1,150 Posted By Dr Sardonicus I did notice one unusual situation: The... I did notice one unusual situation: The characteristic polynomial is x^2 - (u + 1)*x + (u - 1); the discriminant is u^2 - 2*u + 5. As long as this is nonzero (mod p), there are two eigenvalues,...
 Forum: Lounge 2020-09-12, 01:50 Replies: 42 Views: 1,687 Posted By Dr Sardonicus Reminds me of Waldo . (taps fist on... Reminds me of Waldo . (taps fist on head) Here's knocking on wood, hoping that what's raining down doesn't eliminate the whole neighborhood. The year after the Waldo Canyon Fire, the...
 Forum: Miscellaneous Math 2020-09-12, 01:09 Replies: 8 Views: 333 Posted By Dr Sardonicus First example: Taking n = 1, f = 1 divides 2p - 1... First example: Taking n = 1, f = 1 divides 2p - 1 for any p. First example with prime f: p = 3, n = 2; f = 2*22 - 1 = 7 divides 23 - 1 = 7. Second example with prime f: p = 5, n = 4; f = 2*42 -...
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