ianncunha's profile - activity

Yeah, I thought of that. But I would like to know if there is any way to put a function (or something) that returns in the form x_a_b, for a infinite set.

By the way, is easy (but not so good-looking) to define like

def z(a,b):
    z=var('z_%d_%d' %(i,j))
    return z

Nice! If you can send it to me it would be great!

I know it's easy to create a infinite polynomial ring:

R.<y>=InfinitePolynomialRing(ZZ)

But how can I make a infinite polynomial ring with variables indexed by pairs, like x_(a,b)?

Nice! Thak you!

I have a symbolic matrix at the start and I use the determinant to find roots, ok. But when I input some solution of the determinant equation in the matrix again, sage is not able to find the kernel (null space). Here's my atempt:

A=matrix([[x^2,-1.75*x,0],[-1.75*x,x^2,2.07*i*x^2+4.65*i],[0,2.07*i*x^2+-4.65*i,x^2]])
sol=solve(A.det(),x,solution_dict=True)
A.subs(x=sol[0][x]).right_kernel_matrix()

My output is simple:

[]