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Search: Posts Made By: Nick
Forum: Other Mathematical Topics 2021-07-26, 08:29
Replies: 25
Views: 12,270
Posted By Nick
For anyone looking for a fun bit of summer...

For anyone looking for a fun bit of summer reading:
The discrete yet ubiquitous theorems of Carathéodory, Helly, Sperner, Tucker, and Tverberg...
Forum: Hobbies 2021-07-25, 08:16
Replies: 22
Views: 426
Posted By Nick
I once came across a Calculus textbook marked...

I once came across a Calculus textbook marked "Copyright year N" on sale in May of year N-1.
I wondered if students could simply copy it for the next 7 months.
Forum: LaurV 2021-07-22, 17:20
Replies: 10
Views: 394
Posted By Nick
The first version was made while they were still...

The first version was made while they were still at Stanford and the algorithm is therefore public.
Then they turned it into an American corporation...
Forum: Soap Box 2021-07-21, 20:09
Replies: 396
Views: 51,750
Posted By Nick
It could just be a coincidence (there will be...

It could just be a coincidence (there will be lots of times whten this
didn't happen - you don't tend to notice those).
If you are genuinely worried, I would suggest monitoring things like
your...
Forum: Number Theory Discussion Group 2021-07-10, 08:19
Replies: 9
Views: 596
Posted By Nick
We have \(2ax+b-y\equiv 0\pmod{4an}\) and...

We have \(2ax+b-y\equiv 0\pmod{4an}\) and \(\gcd(2a,4an)=2a\neq 1\).
If 2a does not divide b-y then there is no solution.
If instead b-y=2at for some integer t then \(x\equiv -t\pmod{2n}\).
Forum: Number Theory Discussion Group 2021-07-08, 21:57
Replies: 9
Views: 596
Posted By Nick
Yes (assuming you mean discr=(b*)²-4a*c* mod p). ...

Yes (assuming you mean discr=(b*)²-4a*c* mod p).
That is what we mean by Propostion 22 here (https://www.mersenneforum.org/showthread.php?t=21677)
Forum: Number Theory Discussion Group 2021-07-07, 09:20
Replies: 9
Views: 596
Posted By Nick
See section 2.3.2 in the 2nd edition of the book...

See section 2.3.2 in the 2nd edition of the book by Crandall and Pomerance:
"Prime Numbers , a computational perspective" (https://www.springer.com/gp/book/9780387252827)
Forum: Number Theory Discussion Group 2021-07-06, 06:49
Replies: 9
Views: 596
Posted By Nick
Yes, in this subforum already! ...

Yes, in this subforum already!
https://www.mersenneforum.org/showthread.php?t=22058
Forum: Lounge 2021-07-02, 18:17
Replies: 1,011
Views: 92,631
Posted By Nick
Great! The easy one to forget (for people from...

Great! The easy one to forget (for people from the UK) is health insurance,
but I assume you have that sorted too.
Forum: Other Mathematical Topics 2021-06-23, 21:13
Replies: 11
Views: 1,493
Posted By Nick
That's called a confetto!

That's called a confetto!
Forum: Lounge 2021-06-18, 16:17
Replies: 95
Poll: GIMPS shirts
Views: 25,281
Posted By Nick
"Taximeter cabriolet", which we shorten to "taxi"...

"Taximeter cabriolet", which we shorten to "taxi" and you shorten to "cab".
Forum: Languages -- Ancient & Modern, Human & Machine 2021-06-12, 11:57
Replies: 17
Views: 6,813
Posted By Nick
Silbo Gomero...

Silbo Gomero (https://en.wikipedia.org/wiki/Silbo_Gomero) is a whistled language used in the Canary Islands (specifically on La Gomera) to communicate over long distances across deep valleys or...
Forum: Lounge 2021-06-11, 18:01
Replies: 13
Views: 496
Posted By Nick
If I remember rightly, the format was simple...

If I remember rightly, the format was simple enough to reverse engineer with ease up to dBase III, but got somewhat messier after that.
The index files were separate, however, so using a hexdump...
Forum: Soap Box 2021-06-11, 08:13
Replies: 81
Views: 11,743
Posted By Nick
Lake Mead: Largest US reservoir dips to record...

Lake Mead: Largest US reservoir dips to record low
https://www.bbc.com/news/world-us-canada-57436860
Forum: Astronomy 2021-06-11, 08:11
Replies: 42
Views: 3,828
Posted By Nick
A great shot!

A great shot!
Forum: Astronomy 2021-06-10, 10:33
Replies: 42
Views: 3,828
Posted By Nick
We just viewed the partial eclipse here (with...

We just viewed the partial eclipse here (with Eclipse glasses), only about 17% covered but still impressive!
Forum: Miscellaneous Math 2021-06-03, 08:37
Replies: 30
Views: 1,237
Posted By Nick
The mathematics behind this is explained here....

The mathematics behind this is explained here. (https://www.mersenneforum.org/showthread.php?t=21717)
Forum: Soap Box 2021-05-30, 16:45
Replies: 396
Views: 51,750
Posted By Nick
It might fall foul of Lawful Interception...

It might fall foul of Lawful Interception regulations.
Forum: Soap Box 2021-05-28, 22:16
Replies: 35
Views: 3,794
Posted By Nick
Coincidence: I was just reading about a John...

Coincidence: I was just reading about a John Deere baler in a novel by Tom Spanbauer!
Forum: Lounge 2021-05-28, 11:58
Replies: 1,758
RIP
Views: 171,598
Posted By Nick
Kees de Jager...

Kees de Jager (https://en.wikipedia.org/wiki/Kees_de_Jager) Dutch astronomer
Forum: Tales From the Crypt(o) 2021-05-25, 16:23
Replies: 283
Views: 85,204
Posted By Nick
European Court of Human Rights rules against UK...

European Court of Human Rights rules against UK mass surveillance.
Article:...
Forum: Other Mathematical Topics 2021-05-25, 12:21
Replies: 25
Views: 12,270
Posted By Nick
Thanks to Mike for the following tip: ...

Thanks to Mike for the following tip:
https://artofproblemsolving.com/articles/files/SatoNT.pdf

Slight caveat on this one: the puzzles are good but the theory is not always completely precise or...
Forum: Lounge 2021-05-23, 08:59
Replies: 1,107
Views: 91,453
Posted By Nick
"Rocket plane flies to edge of space" ...

"Rocket plane flies to edge of space"
https://www.bbc.com/news/science-environment-57214988

It's a pity they mean the start of space and not the end...
Forum: Miscellaneous Math 2021-05-23, 08:55
Replies: 33
Views: 1,623
Posted By Nick
Mathematicians do it that way because (a^b)^c can...

Mathematicians do it that way because (a^b)^c can simply be written as a^(bc) with
no need for an extra level!
Forum: Science & Technology 2021-05-20, 14:49
Replies: 230
Views: 16,386
Posted By Nick
The Dutch government's invitation letter plays...

The Dutch government's invitation letter plays perfectly to our psychology:
"We have a vaccine ready for you. You don't have to take it, but it's free!"
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