[sage-support] Re: Broken links to http://sage.math.washington.edu/home/SimonKing/Cohomology/
Hi Scott, On 2015-08-28, Scott Morrison scott.morri...@gmail.com wrote: There are a number of sources around the web that refer to http://sage.math.washington.edu/home/SimonKing/Cohomology/ for explanations of doing group cohomology calculations in Sage, but that link is now broken. Wow, that's bad. And I (as the maintainer) was not aware of the change in permission. (And hence I, personally, gave up on using Sage to do my group cohomology calculations...) Did you use my spkg already, or did you give up before trying? Anyway, on my web page you should find an spkg that works with the current version of Sage (but that spkg is under review, and older versions of the spkg suffer from backward incompatible changes in Sage). Is it possible to restore that URL, or provide a redirect to the new home of the content (if there is one)? I try to fix it (i.e., find someone who *can* fix it). (Also, if I should report this somewhere else, please let me know. It's not obvious. :-) I guess it's fine here. Thank you for your report! Simon -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Broken links to http://sage.math.washington.edu/home/SimonKing/Cohomology/
There are a number of sources around the web that refer to http://sage.math.washington.edu/home/SimonKing/Cohomology/ for explanations of doing group cohomology calculations in Sage, but that link is now broken. (And hence I, personally, gave up on using Sage to do my group cohomology calculations...) Is it possible to restore that URL, or provide a redirect to the new home of the content (if there is one)? (Also, if I should report this somewhere else, please let me know. It's not obvious. :-) best regards, Scott Morrison -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Re: Broken links to http://sage.math.washington.edu/home/SimonKing/Cohomology/
On 2015-08-28, Scott Morrison scott.morri...@gmail.com wrote: There are a number of sources around the web that refer to http://sage.math.washington.edu/home/SimonKing/Cohomology/ for explanations of doing group cohomology calculations in Sage, but that link is now broken. Wow, that's bad. And I (as the maintainer) was not aware of the change in permission. I think that was a result of some legal wrangling at UW regarding what Sage stuff is/isn't permissible, and at least for some time everything was turned off... iirc? William, I recall you saying that, for the long-term, hosting precisely this kind of research-oriented thing was going to be permitted - is that correct, or did I misunderstand things there? -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Re: Broken links to http://sage.math.washington.edu/home/SimonKing/Cohomology/
Hi Karl-Dieter, On 2015-08-28, kcrisman kcris...@gmail.com wrote: I think that was a result of some legal wrangling at UW regarding what Sage stuff is/isn't permissible, and at least for some time everything was turned off... iirc? William, I recall you saying that, for the long-term, hosting precisely this kind of research-oriented thing was going to be permitted - is that correct, or did I misunderstand things there? I hope so. What's worse: I cannot even ssh into sage.math.washington.edu, my password isn't accepted. Best regards, Simon -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Strange _.extension() function behavior
Hullo all, Can someone explain the following behavior to me? I would like to to create an extension of the field of rational functions in one variable 'y' over the finite field of three elements by adjoining a root of unity 'Y' and an element of Carlitz torsion 'X'. I run the following commands: sage: A.y = GF(3)[]; A sage: w = polygen(A) sage: K = Frac(A);K sage: A1.X = K.extension(w^8 + (y^3 + y + 2)*w^2 + (y^2 + 2*y + 2)); A1 sage: B1.Y = A1.extension(w^2+2*w+2); B1 Note that 'w^2+2*w+2' is irreducible over GF(3), and 'w^8 + (y^3 + y + 2)*w^2 + (y^2 + 2*y + 2)' is irreducible over 'A'. All fields are generated successfully. Trying to multiply 'X' and 'Y' or even 'y' and 'Y' then yields a NotImplementedError. This seems crazy to me, since by the output for 'B1', it knows it is an extension of 'A1', but it gets crazier. If instead I restart my worksheet and run: sage: A.y = GF(3)[]; A sage: w = polygen(A) sage: K = Frac(A);K sage: A1.X = K.extension(w^9 + (y^3 + y + 2)*w^3 + (y^2 + 2*y + 2)*w); A1 sage: B1.Y = A1.extension(w^2+2*w+2); B1 where I have multiplied through by 'w' in the modulus of 'A1', the extensions are generated correctly, and one may do arithmetic in all variables 'X', 'Y', and 'y'. I already have a workaround, but this behavior seems like a bug. So I thought I would ask. What's going on here? All the best, Rudy -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Re: Broken links to http://sage.math.washington.edu/home/SimonKing/Cohomology/
On Fri, Aug 28, 2015 at 5:59 AM, kcrisman kcris...@gmail.com wrote: On 2015-08-28, Scott Morrison scott.morri...@gmail.com wrote: There are a number of sources around the web that refer to http://sage.math.washington.edu/home/SimonKing/Cohomology/ for explanations of doing group cohomology calculations in Sage, but that link is now broken. Wow, that's bad. And I (as the maintainer) was not aware of the change in permission. I think that was a result of some legal wrangling at UW regarding what Sage stuff is/isn't permissible, and at least for some time everything was turned off... iirc? William, I recall you saying that, for the long-term, hosting precisely this kind of research-oriented thing was going to be permitted - is that correct, or did I misunderstand things there? Yes, everything you said is right. The additional orthogonal problem is that I failed to get some grants, so I have no money to pay for hosting of many of my computers. As a result many are sitting in a pile on the floor. The ones that are left aren't in a great state -- with the last of my NSF money, I hired Andrew Ohana to spend a few weeks getting things reconfigured and working, but it wasn't enough time, and I don't have the time right now. Simon, etc. -- find hosting elsewhere. Github makes hosting of 2GB binaries for free trivial, so use that. William -- William Stein Professor of Mathematics University of Washington http://wstein.org -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Re: Strange _.extension() function behavior
I should add that I am running all of the above commands on the SMC on a free account. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Re: Broken links to http://sage.math.washington.edu/home/SimonKing/Cohomology/
On Friday, 28 August 2015 07:20:12 UTC-7, Simon King wrote: Hi Karl-Dieter, On 2015-08-28, kcrisman kcri...@gmail.com javascript: wrote: I think that was a result of some legal wrangling at UW regarding what Sage stuff is/isn't permissible, and at least for some time everything was turned off... iirc? William, I recall you saying that, for the long-term, hosting precisely this kind of research-oriented thing was going to be permitted - is that correct, or did I misunderstand things there? I hope so. What's worse: I cannot even ssh into sage.math.washington.edu, my password isn't accepted. combinat.math.washington.edu http://sage.math.washington.edu will still give you ssh access, to the same files in your homedir. (at least it works for me). I'd suggest that you start by, at least, hosting the package's git (or is it hg?) repo on github. This takes 5 minutes to set up on a reasonably fast network connection, including setting up a github account. Dima -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
