Is there any recommendation on how to construct "block vectors" (in analogy to
`sage.matrix.special.block_matrix`) in readable way?
We probably do not have subdivisions of vectors in the same way as we have
subdivisions of matrices, but still: the options I see so far are
sage: v1 = vector(
I think the problem is rather fundamental. The expression Rootof(y^2-x,y)
has two possible values; nominally sqrt(x) and -sqrt(x), but you can only
tell them apart once you've fixed one of them. So if you are just faced with
Rootof(y^2-x,y) + Rootof(y^2-x,y)
you don't actually know whether that
unfortunately, this doesn't really help: the main reason is that the roots
may not have an explicit expression in terms of radicals. See
https://trac.sagemath.org/ticket/32143
But even when explicit expressions exist, there seems to be a problem:
sage: var("y a")
(y, a)
sage: p = y^4 + y + a
s
On Thu, Jul 08, 2021 at 09:25:00AM +, Thierry wrote:
> Hi,
>
> On Thu, Jul 08, 2021 at 12:00:36AM -0700, Emmanuel Charpentier wrote:
> > I could connect to ask.sagemath.org on Jul 8, 2021 at about 7:30 CEST, but
> > no longer around 8;30 CEST. Air conditioning acting up again ?
>
> Probably
Hi,
On Thu, Jul 08, 2021 at 12:00:36AM -0700, Emmanuel Charpentier wrote:
> I could connect to ask.sagemath.org on Jul 8, 2021 at about 7:30 CEST, but
> no longer around 8;30 CEST. Air conditioning acting up again ?
Probably not this time, i did reboot the host this morning but something went
wr
You may work on the univariate polynamial ring in your variable of interest
over a suitable ring. A simple example :
sage: var("x, y, z")
(x, y, z)
sage: foo=x^3-x*sin(y+z)+1
sage: foo.polynomial(ring=PolynomialRing(SR,"x")).parent()
Univariate Polynomial Ring in x over Symbolic Ring
sage: foo.
I could connect to ask.sagemath.org on Jul 8, 2021 at about 7:30 CEST, but
no longer around 8;30 CEST. Air conditioning acting up again ?
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