Sagemath Code

When I was young I used to work with Mathematica for symbolic computation. I switched to Maple when Mathematica failed to compute a discriminant. Maple was quite useful but it was a mesh the changes of syntaxis after updating. Moreover GAP and Singular were more successful in most of my tasks, with the problem of communicating between them. This is why I finally moved to Sagemath, high quality free software containing them. I am not a developer but we are lucky in our team to have Miguel Marco, one of Sagemath developers. Anyway, you may find here some code which may be useful,

Enrique Artal 2016-12-06