[sage-support] Re: How should I determine if two strongly regular graphs are isomorphic?

Do I get it right that each graph of yours can be constructed from a projective 2-weight code over GF(2)? Sage has a small database of such codes, so one can add your graphs there in this form. See strongly_regular_from_two_intersection_set and strongly_regular_from_two_weight_code in

Re: [sage-support] integral points on ellipitc curves

Thank you both for the answers, I found another problematic example sage:E1=EllipticCurve([0,0,0,37,18]);E1;S=E1.integral_points();S; Elliptic Curve defined by y^2 = x^3 + 37*x + 18 over Rational Field [(2 : 10 : 1), (126 : 1416 : 1)] and R = E1(64039202,512470496030);M=E1(2,10 );3*M==R

Re: [sage-support] integral points on ellipitc curves

On Wednesday, December 14, 2016 at 12:09:36 PM UTC-8, John Cremona wrote: > > > Thanks for the bug report. As Nils pointed out there are known bugs > in the integral point code which cause solutions to be missed. Just to make clear: I wasn't taking a jibe at sage/or John on this, and I wasn't

[sage-support] Re: Sage crash report 7.0

On Wednesday, December 14, 2016 at 7:31:30 PM UTC, Laurent Bakri wrote: > > > Hmm.. this is getting hard to follow the thread... > Yes there is a reason I can't upgrade (with the last gcc there is an > error on flint described here "-r and -pie may not be used together" >

Re: [sage-support] integral points on ellipitc curves

Dear Costas, Thanks for the bug report. As Nils pointed out there are known bugs in the integral point code which cause solutions to be missed. A lot of work has been spent on improving this, in part by me, and the main reason the fixes have not yet been approved and merged is that I still had

[sage-support] Re: Sage crash report 7.0

Hmm.. this is getting hard to follow the thread... Yes there is a reason I can't upgrade (with the last gcc there is an error on flint described here "-r and -pie may not be used together"

[sage-support] Re: integral points on ellipitc curves

On Wednesday, December 14, 2016 at 9:07:50 AM UTC-8, draz...@gmail.com wrote: > > > Any idea why sage did not provide the point Q? > I used sage version 6.9. > It's sage's own code. Sage is definitely following a venerable tradition of getting integer points on elliptic curves wrong. -- You

[sage-support] integral points on ellipitc curves

Hi all, I came across the following example... sage: E1=EllipticCurve([0,0,0,49,-64]);E1;S=E1.integral_points();S; Elliptic Curve defined by y^2 = x^3 + 49*x - 64 over Rational Field [(4 : 14 : 1), (464 : 9996 : 1)] but the following integer point Q belongs also to the curve

Re: [sage-support] Re: Sage crash report 7.0

On Wednesday, December 14, 2016 at 3:44:19 PM UTC, NITIN DARKUNDE wrote: > > Hello, I have some old version of sage installed two years ago on my > laptop. Also some worksheets are saved on it. How to upgrade it to latest > 7.4 version? Whether old saved worksheets will remain saved? or get

Re: [sage-support] Re: Sage crash report 7.0

Hello, I have some old version of sage installed two years ago on my laptop. Also some worksheets are saved on it. How to upgrade it to latest 7.4 version? Whether old saved worksheets will remain saved? or get deleted? On Dec 14, 2016 9:08 PM, "Dima Pasechnik" wrote: Is

[sage-support] Re: Sage crash report 7.0

Is there any reason you cannot upgrade to a more recent version? The current stable version is 7.4. On Wednesday, December 14, 2016 at 1:28:09 PM UTC, Laurent Bakri wrote: > > > > Hi all, > I am using sage on Debian (sid) > Sagemath 7.0 was working fine until an upgrade of python to version 3

[sage-support] Sage crash report 7.0

Hi all, I am using sage on Debian (sid) Sagemath 7.0 was working fine until an upgrade of python to version 3 Then it stop working with an syntax error due to python 3 So I (re)lnked pyhton to python 2.7 but now it crashes for a reason I cannot determine here is the crash report Thanks