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Forum: CADO-NFS 2021-10-22, 06:24
Replies: 3
Views: 141
Posted By ccorn
If you have -march specified in your CFLAGS,...

If you have -march specified in your CFLAGS, CXXFLAGS, CPPFLAGS, e.g. -march=haswell, and your build machine does not support that (e.g. because it is -march=sandybridge), then some autoconfiguration...
Forum: Factoring 2021-03-03, 17:29
Replies: 18
Views: 4,163
Posted By ccorn
Here is my superficial impression, gathered from...

Here is my superficial impression, gathered from the PDFs linked at the university's lattice algorithms course page (https://www.math.uni-frankfurt.de/~dmst/teaching/WS2019/vorlesung.html). I might...
Forum: Factoring 2021-03-03, 15:00
Replies: 18
Views: 4,163
Posted By ccorn
Better look at the more recent draft...

Better look at the more recent draft (https://www.math.uni-frankfurt.de/~dmst/teaching/WS2019/SVP9.pdf). I do not consider it likely that Schnorr himself would have posted such an outdated (and...
Forum: Msieve 2020-09-27, 18:49
Replies: 2
Views: 2,812
Posted By ccorn
I have proposed a diff to the PKGBUILD on its AUR...

I have proposed a diff to the PKGBUILD on its AUR page (https://aur.archlinux.org/packages/msieve/).
Forum: Math 2018-09-24, 19:49
Replies: 20
Views: 4,022
Posted By ccorn
LuboŇ° Motl is rather disappointed: Nice try...

LuboŇ° Motl is rather disappointed:

Nice try but I am now 99% confident that Atiyah's proof of RH is wrong, hopeless...
Forum: Linux 2016-05-11, 15:40
Replies: 11
Views: 3,130
Posted By ccorn
Funnily enough, the "edit" command in the DOS box...

Funnily enough, the "edit" command in the DOS box ("run command...") can deal with unix line endings; just opening and saving the text file should convert the line endings to CR LF. At least that was...
Forum: Puzzles 2012-10-31, 16:48
Replies: 43
Views: 2,963
Posted By ccorn
For r < 2^16, seems to need extra bytes for...

For r < 2^16, seems to need extra bytes for fractional parts and uses too many steps.
For r > 2^16 (ok, ok...) accuracy degrades (in terms of absolute pixel distance).
But slick, yes, in the...
Forum: Puzzles 2012-10-26, 04:33
Replies: 43
Views: 2,963
Posted By ccorn
It is a different path: gravitational pull causes...

It is a different path: gravitational pull causes one of the ellipse's foci to be at the center of mass. Linear pull causes the ellipse's center to be at the center of mass. In the linear case, the...
Forum: Puzzles 2012-10-23, 18:20
Replies: 43
Views: 2,963
Posted By ccorn
I used that simple recipe too, in school times,...

I used that simple recipe too, in school times, for a computer game, with a gravitational law instead of this linear one. No overall energy leaks, no problem.
Half a decade later I learned that it...
Forum: Computer Science & Computational Number Theory 2012-08-02, 22:01
Replies: 103
Views: 12,396
Posted By ccorn
I only met examples of the latter, but in places...

I only met examples of the latter, but in places where one would put an abstract, so I guessed the meaning to be a figurative "top left [to] down right". :grin:

P.S.: Yes, "top" and "down" are not...
Forum: Factoring 2012-04-04, 23:09
Replies: 7
Views: 1,719
Posted By ccorn
Nice one, except that there is still one...

Nice one, except that there is still one (potentially shorter) division by a when calculating p.
You should add r >= 0 as a condition. For r = 0, the polynomial in x reduces to the empty sum, i. e....
Forum: Factoring 2012-04-04, 22:00
Replies: 7
Views: 1,719
Posted By ccorn
For even r, the above polynomial in x would end...

For even r, the above polynomial in x would end in +1, not in -1.
Forum: Programming 2012-03-19, 19:01
Replies: 14
Views: 3,844
Posted By ccorn
The usage recommended by newer autoconf versions...

The usage recommended by newer autoconf versions is to pass those settings as command-line arguments like this:
./configure CPPFLAGS=-I/opt/local/include LDFLAGS=-L/opt/local/lib
The classic usage...
Forum: Programming 2012-03-13, 13:49
Replies: 14
Views: 3,844
Posted By ccorn
There are no -L flags in the link line. Add...

There are no -L flags in the link line. Add CPPFLAGS=-I/opt/local/include LDFLAGS=-L/opt/local/lib to your ./configure command. (Replace /opt/local with your MacPorts prefix.) Another option: Use...
Forum: Programming 2012-03-12, 09:56
Replies: 14
Views: 3,844
Posted By ccorn
Inspecting config.log should clarify this. ...

Inspecting config.log should clarify this.

If so, then the MacPorts port of inkscape should pass this stage.
(MacPorts sets CPPFLAGS and LDFLAGS or C_INCLUDE_PATH and LIBRARY_PATH with...
Forum: Puzzles 2012-02-21, 00:19
Replies: 18
Views: 2,905
Posted By ccorn
I can, but it's just a rational function s(V,n)...

I can, but it's just a rational function s(V,n) where V is a given total number of glasses and n is the number of levels. You can do that yourself.

Edit: Compute numerator s.num and denominator...
Forum: Puzzles 2012-02-21, 00:00
Replies: 18
Views: 2,905
Posted By ccorn
Assuming a polygonal number...

Assuming a polygonal number (https://en.wikipedia.org/wiki/Polygonal_number) P(s,i)=\frac{1}{2}\left((s-2)i^2 - (s-4)i\right) of glasses at level i, with s the same constant for all levels, you would...
Forum: Puzzles 2012-02-20, 23:13
Replies: 18
Views: 2,905
Posted By ccorn
It's a pyramid with triangles at each level, each...

It's a pyramid with triangles at each level, each triangle packed regularly with glasses in the (2-dimensional) densest possible way, one glass at the top, and each non-top level having its side...
Forum: Lounge 2012-02-07, 00:12
Replies: 1,374
Views: 101,368
Posted By ccorn
Elsevier

Researchers boycotting Elsevier, demanding a policy change towards easier access:

The Economist: Scientific publishing: The price of information (http://www.economist.com/node/21545974)

Found...
Forum: Puzzles 2012-02-05, 16:23
Replies: 4
Views: 979
Posted By ccorn
This one tries to emphasize cartesian products. ...

This one tries to emphasize cartesian products.

__________________________________________________________.
| | | | | | | |
| | | | | ...
Forum: Math 2012-01-29, 11:30
Replies: 2
Views: 1,677
Posted By ccorn
Yes, for any m coprime to n. The key algorithm is...

Yes, for any m coprime to n. The key algorithm is fundamental and famous: Look up the Extended Euclidean Algorithm (http://en.wikipedia.org/wiki/Extended_Euclidean_Algorithm) (XGCD). You ask for y...
Forum: Twin Prime Search 2012-01-25, 19:23
Replies: 2
Views: 7,562
Posted By ccorn
I am not involved in the twin prime search and I...

I am not involved in the twin prime search and I am not familiar with its data. However...


This is generally possible, particularly if your data (i. e. the sampled random variable values) have a...
Forum: Miscellaneous Math 2012-01-24, 07:22
Replies: 34
Views: 3,229
Posted By ccorn
Where is the logical link (the reasoning) between...

Where is the logical link (the reasoning) between all those requirements and your desired conclusion?

The current state, as I perceive it, is that you list a number of true properties (mostly laid...
Forum: Miscellaneous Math 2012-01-23, 21:20
Replies: 34
Views: 3,229
Posted By ccorn
Aha. For what reason? For the time being, take p...

Aha. For what reason? For the time being, take p = 5, m=341 as a counterexample. There may well be a large gcd(phi(m),m-1).
Also, consider Batalov's second counterexample.
Forum: Miscellaneous Math 2012-01-23, 20:08
Replies: 34
Views: 3,229
Posted By ccorn
If you require p | (m - 1), you cannot conclude...

If you require p | (m - 1), you cannot conclude p^2 | m anyway...

P.S.: You have presented no reasoning why from such phi(a) | phi(b) you could possibly conclude a | b. In fact, many coprime...
Showing results 1 to 25 of 151

 
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