Re: [sage-support] Apparently Sage lost Python

2020-04-03 Thread Dima Pasechnik
On Sat, 4 Apr 2020, 12:25 Anita Rojas, wrote: > Thanks. I did: > > sudo spctl --master-disable > > and it worked. I have a question: Did I leave my computer vulnerable by > doing so? > it depends upon settings of your usual account. If it allows password-less automatic installation of random stu

Re: [sage-support] Apparently Sage lost Python

2020-04-03 Thread Anita Rojas
Thanks. I did: sudo spctl --master-disable and it worked. I have a question: Did I leave my computer vulnerable by doing so? Second: I was used to use notebook() but it did not work. Deep thanks for your help Anita On Sat, Apr 4, 2020 at 12:54 AM Dima Pasechnik wrote: > yes, this is an i

Re: [sage-support] Apparently Sage lost Python

2020-04-03 Thread Dima Pasechnik
yes, this is an issue due to Apple "improving" their security in the latest MacOS. I believe there are instructions on https://ask.sagemath.org/question/49568/new-sagemath-90-installation-not-running-on-catalina-sagemath-87-worked-fine/ and perhaps other posts there. On Sat, 4 Apr 2020, 11:47 An

Re: [sage-support] Apparently Sage lost Python

2020-04-03 Thread Anita Rojas
Thanks a lot! I am installing a new version of sage. I have received several times (more than 20) a message like macOS no puede verificar el desarrollador de la app “_ sha3.cpython-37m-darwin.so”. ¿Seguro que quieres abrirla? Which means that the developer is unknown and it asks me if I want to o

Re: [sage-support] Apparently Sage lost Python

2020-04-03 Thread Dima Pasechnik
On Sat, 4 Apr 2020, 11:11 Anita Rojas, wrote: > Hi! I am far away of being a OSX guru, but I managed to get my SAGE > working. > > It use to work properly but now I got the following message: > > > Error: Tried to use Sage's Python which was not yet installed. > > If this was called from an spkg-

[sage-support] Apparently Sage lost Python

2020-04-03 Thread Anita Rojas
Hi! I am far away of being a OSX guru, but I managed to get my SAGE working. It use to work properly but now I got the following message: Error: Tried to use Sage's Python which was not yet installed. If this was called from an spkg-install script for another package you should add $(PYTH

[sage-support] Different ways of rounding

2020-04-03 Thread Simon King
Hi! According to IEEE 754, the default rounding mode for floating-point operations is "round half to even". However, if one calls "round" on elements of RR, the rounding apparently is "round half away from zero if the total number of digits in the result is odd and towards zero if the total number

[sage-support] Slow Computations in Quotient Rings

2020-04-03 Thread finotti
A student of mine is trying to use Sage to prove the commutativity of the group law of elliptic curves. Below is the code used when trying to show (P + Q) + R = P + (Q + R), when R = P + Q. I let it run for almost 4 hours with no result. The same code translated to Magma was instantaneous. A