On Thu, Jun 18, 2009 at 11:24 AM, John Cremona<john.crem...@gmail.com> wrote: > > > > On Jun 17, 5:34 pm, William Stein <wst...@gmail.com> wrote: >> 2009/6/17 Robert Bradshaw <rober...@math.washington.edu>: >> >> >> >> > On Jun 17, 2009, at 4:05 AM, John Cremona wrote: >> >> >> I think is is easier, both on the eye and for a beginner to >> >> understand: >> >> >> sage: x = polygen(ZZ) >> >> sage: f = 2*x**2 - x >> >> sage: f.factor() >> >> x * (2*x - 1) >> >> > Perhaps. I like the R[var] notation because it's a direct translation >> > of the mathematical notation. >> >> I love the R[var] notation too. I remember making it up and being very >> pleased. > > Sure. However you cannot do R=ZZ[t] but must do R=ZZ['t'], and then > do something else to get the variable t to be assigned to the variable > which prints as 't'. that means either R.<t>=ZZ['t'] (which to a > mathematician looks like double definition),
You can also do sage: R.<t> = ZZ[] which doesn't look like a double definition. That's what I usually do. William --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
