On Monday, 14 April 2025 at 10:05:20 UTC-7 Georgi Guninski wrote:
I continue to think this is at least one bug.
There is an easy fix via change_ring():
sage:
M=F.adjacency_matrix();f=M.characteristic_polynomial();f=f.change_ring(AA)
: ;ro=f.roots();sum(e for _,e in ro)
90
I'm not
On Mon, Apr 14, 2025 at 12:33 PM John H Palmieri
wrote:
> It seems that the most recent version of patch in homebrew no longer
> provides automatic access to a binary "patch" (which I think it used to
> do); instead it says
>
> If you need to use it as "patch", you can add a "gnubin" director
While you can download the tarfile from
https://ftp.gnu.org/gnu/patch/patch-2.7.6.tar.gz into upstream/
it's more economic to use Homebrew for patch, and many more dependencies.
PS. I gather that macOS patch is good enough nowadays, and we can use
it, as proposed on https://github.com/sagemath/sag
I continue to think this is at least one bug.
There is an easy fix via change_ring():
sage: M=F.adjacency_matrix();f=M.characteristic_polynomial();f=f.change_ring(AA)
: ;ro=f.roots();sum(e for _,e in ro)
90
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On Monday, 14 April 2025 at 09:16:49 UTC-7 dim...@gmail.com wrote:
One would wish there was a way to tell the system from the beginning
that this particular polynomial has only real roots.
Perhaps there is an easy way to implement is (a class of real-rooted
polynomials), no?
Dima
Well, the
On Mon, Apr 14, 2025 at 10:58 AM Nils Bruin wrote:
>
> It looks like a is an element of "Qbar". Elements there are tracked by
> keeping track of a way to compute a polynomial it is a root of as well as a
> complex "ball" that allows one to distinguish it from other roots of the
> polynomial. Ce
It looks like a is an element of "Qbar". Elements there are tracked by
keeping track of a way to compute a polynomial it is a root of as well as a
complex "ball" that allows one to distinguish it from other roots of the
polynomial. Certain operations will force the actual computation of the
min
Marc, Your response seems to suggest that Dima is claiming that your
distribution of Sage is wrong or shouldn't exist. Nothing could be
further from the truth.
Really? What does the following mean to you?
"I don't want to go into merits of the macOS app, but it's a highly
non-standard by m
I think this is at least one bug on 10.5 on linux, attached is testcase
F=Graph(SNIP) #90 vertices
spe=F.spectrum()
a=spe[64]
print("(1):a=",a) #(1) -1.717980512878350? + 0.?e-60*I #XXX imaginary part
print("(2):a=",a,"poly=",a.minpoly()) #(2): -1.717980512878350? poly=
x^4 + 5*x^3 - 19*x - 16 #XX
