mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 25 of 1000
Search took 0.25 seconds.
Search: Posts Made By: Dr Sardonicus
Forum: Science & Technology 2021-06-12, 15:55
Replies: 224
Views: 13,756
Posted By Dr Sardonicus
I think this guy's yet-to-be-invented "universal...

I think this guy's yet-to-be-invented "universal vaccine" qualifies as "less effective."

Geert Vanden Bossche Stokes Fear of COVID-19 Vaccine To Promote His Own Flawed 'Solution'...
Forum: Soap Box 2021-06-12, 15:37
Replies: 78
Views: 10,368
Posted By Dr Sardonicus
IMO Intel is more likely to leave if/when their...

IMO Intel is more likely to leave if/when their tax parasitism incentive provisions become less attractive. For example, they're getting an 80% discount on their property taxes.
Forum: Number Theory Discussion Group 2021-06-12, 15:03
Replies: 6
Views: 292
Posted By Dr Sardonicus
No. In (1), a^2 + b^2 =/= 0 (mod f) is not...

No.

In (1), a^2 + b^2 =/= 0 (mod f) is not sufficient to insure that a^2 + b^2 has a multiplicative inverse (mod f).

I leave the determination of the appropriate condition as an exercise.
...
Forum: Number Theory Discussion Group 2021-06-10, 12:43
Replies: 6
Views: 292
Posted By Dr Sardonicus
As already observed, taking a^2 and b^2 congruent...

As already observed, taking a^2 and b^2 congruent to 0 and 1 (mod f) is always a solution. Thus [0, 1] or [0, f-1] always work.

If f has more than one prime factor, there will be other solutions...
Forum: Lounge 2021-06-10, 12:03
Replies: 225
Views: 39,387
Posted By Dr Sardonicus
Perhaps the birds are just cleaning up after the...

Perhaps the birds are just cleaning up after the messy squirrels...
Forum: Lounge 2021-06-09, 14:39
Replies: 1,733
RIP
Views: 163,872
Posted By Dr Sardonicus
Martha White...

Martha White (https://apnews.com/article/louisiana-boycotts-2e8c4355a86f83bc65ec8fd963bcc017)
Forum: And now for something completely different 2021-06-08, 11:48
Replies: 4
Views: 182
Posted By Dr Sardonicus
I see the OP has answered graciously. :tu: I...

I see the OP has answered graciously. :tu:

I would have been tempted to answer "Yes." :wink:

I point out If the attached file was supposed to prove that 10^n + 7 is composite for all other n,...
Forum: Lounge 2021-06-06, 12:47
Replies: 236
Views: 28,136
Posted By Dr Sardonicus
As some may know, Operation Overlord (better...

As some may know, Operation Overlord (better known as D-Day), commenced on June 6, 1944. One indication of Dwight Eisenhower's view of leadership was that he anticipated the possibility that the...
Forum: Number Theory Discussion Group 2021-06-04, 14:08
Replies: 1
Views: 124
Posted By Dr Sardonicus
(n^2 - b*n)/(2*n+k-b) may be rewritten as ...

(n^2 - b*n)/(2*n+k-b) may be rewritten as

n/2 - (b+k)/4 + (k^2 - b^2)/(8*n+4*k-4*b)

The only way to make the expression a fraction whose denominator remains bounded as n increases without...
Forum: Hobbies 2021-06-04, 13:36
Replies: 111
Views: 32,946
Posted By Dr Sardonicus
Those pictures are informative. I'm guessing...

Those pictures are informative.

I'm guessing those little ponds by the foundation are where plants were dug out.

I don't know how long those ponds persist, but if it's more than a week you...
Forum: Information & Answers 2021-06-04, 13:24
Replies: 34
Views: 1,126
Posted By Dr Sardonicus
Congratulations on finding a factor! ...

Congratulations on finding a factor!

According to the detailed status report for exponent 168713323 (https://www.mersenne.org/report_exponent/?exp_lo=168713323&exp_hi=&full=1), TF was working the...
Forum: Lounge 2021-06-04, 12:56
Replies: 1,733
RIP
Views: 163,872
Posted By Dr Sardonicus
F. Lee Bailey...

F. Lee Bailey (https://www.cnn.com/2021/06/03/us/f-lee-bailey-lawyer-dies/index.html)
Forum: Lounge 2021-06-04, 12:51
Replies: 4,317
Views: 338,264
Posted By Dr Sardonicus
They've tried. It's really, really iffy. It...

They've tried. It's really, really iffy. It tends to rot.
Forum: Miscellaneous Math 2021-06-03, 13:53
Replies: 30
Views: 947
Posted By Dr Sardonicus
Using Nick's excellent presentation (linked to...

Using Nick's excellent presentation (linked to above), the interested reader will have no trouble showing that for each positive integer n, in base ten there are exactly two n-digit idempotents...
Forum: Puzzles 2021-06-02, 23:39
Replies: 20
Views: 978
Posted By Dr Sardonicus
It's not clear to me what is allowed. Apparently...

It's not clear to me what is allowed. Apparently you are allowed to switch pairs, and keep track of which pairs you've switched. Given n envelopes and n letters, a given pairing-up of letters and...
Forum: Operation Billion Digits 2021-06-02, 02:46
Replies: 11
Views: 794
Posted By Dr Sardonicus
my what?? :w00t: Maybe yours![/QUOTE]:paul: Not...

my what?? :w00t:
Maybe yours![/QUOTE]:paul: Not "people." "Klingons!"
Forum: kriesel 2021-06-01, 14:02
Replies: 64
Views: 21,103
Posted By Dr Sardonicus
The worst passenger ship disaster in the US, the...

The worst passenger ship disaster in the US, the burning of the General Slocum on June 15, 1904, killed over a thousand people. The ship had been inspected and found "safe" a month earlier. ...
Forum: Operation Billion Digits 2021-06-01, 13:31
Replies: 11
Views: 794
Posted By Dr Sardonicus
There appears to be plenty of TF work available...

There appears to be plenty of TF work available seeking small factors of 2^p - 1 for p currently under consideration by GIMPS.

There is also plenty of work available to try to crack 2^p - 1 which...
Forum: Hardware 2021-05-31, 14:30
Replies: 59
Views: 2,843
Posted By Dr Sardonicus
Tangible forms of money - particularly precious...

Tangible forms of money - particularly precious metals - are reusable, and have the advantage that they obviate any question about whether the payer has it. Of course, they have the disadvantage...
Forum: Lone Mersenne Hunters 2021-05-30, 13:41
Replies: 1,890
Views: 235,369
Posted By Dr Sardonicus
Liar! Only 109 bits, 109.25 to be more exact....

Liar! Only 109 bits, 109.25 to be more exact. :razz:[/QUOTE]Oops.

From my "I can't count" liturgy:

Versicle: How many bits in two to the first power?

Responsory: Two, two.

Versicle: How...
Forum: Hobbies 2021-05-29, 12:36
Replies: 111
Views: 32,946
Posted By Dr Sardonicus
The ornamental Agave americana is commonly known...

The ornamental Agave americana is commonly known as the "century plant," although it usually only grows for 10-20 years before it flowers and dies.†

Fargesia nitida seems much more deserving of...
Forum: Soap Box 2021-05-28, 23:56
Replies: 34
Views: 3,164
Posted By Dr Sardonicus
The present situation is industry-wide. From the...

The present situation is industry-wide. From the story I linked to:
Forum: Lounge 2021-05-28, 23:45
Replies: 25
Views: 786
Posted By Dr Sardonicus
In theory, the victim could sue the dog's owner...

In theory, the victim could sue the dog's owner for any resulting injury or damage. In practice, it's better if the at-fault owners just do the right thing.

There were two (non-traffic)...
Forum: Hobbies 2021-05-28, 23:17
Replies: 111
Views: 32,946
Posted By Dr Sardonicus
I have a vague recollection from around 1980 of...

I have a vague recollection from around 1980 of seeing a story on the national news about bamboo and the giant panda. The bamboo in one region in Sichuan Province where the giant panda lives was...
Forum: Lounge 2021-05-28, 13:59
Replies: 25
Views: 786
Posted By Dr Sardonicus
Things don't work like that here.[/QUOTE]I wasn't...

Things don't work like that here.[/QUOTE]I wasn't being entirely serious... I don't know of anywhere that things DO work that way. Hopefully your own insurance will pay the bills. Hopefully they...
Showing results 1 to 25 of 1000

 
All times are UTC. The time now is 12:11.

Sun Jun 13 12:11:59 UTC 2021 up 16 days, 9:59, 0 users, load averages: 1.96, 2.07, 2.05

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.