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Using computer-aid approach to solve algebraic problems. Questions with this tag should typically include at least one other tag indicating what sort of algebraic problem is involved, such as ac.commutative-algebra or rt.representation-theory or ag.algebraic-geometry.

10 votes
2 answers
520 views

Monomial orderings in noncommutative setting

An ordering of monomials in the free associative algebra $k\langle x_1,\ldots,x_n\rangle$ is called a monomial ordering (EDIT: it seems that an equally common term used in this context is "term orderi …
Vladimir Dotsenko's user avatar
30 votes

Computer algebra errors

A friend of mine told me about his experience with Maple (version 5 or 6, I think) when dealing with matrices over $\mathbb{Q}(\sqrt{2},\sqrt{3})$. When he computed the rank and the determinant for on …
3 votes

Grobner basis of a submodule of a free module over polynomial ring

What exactly you Googled? There are many standard references, e.g. "Gröbner bases and primary decomposition of modules", by Elizabeth W.Rutman (https://www.sciencedirect.com/science/article/pii/074771 …
Vladimir Dotsenko's user avatar
3 votes
0 answers
114 views

Checking the generic rank of a matrix

Suppose that $A,B\in M_{p,q}(\mathbb{Z})$ are two rectangular integer matrices of the same size. Suppose that one has a conjecture stating that the rank of the matrix $A+tB$ for Zariski generic values …
Vladimir Dotsenko's user avatar
4 votes

Open source mathematical software

For all sorts of Groebner bases-related computation (I believe you might need some at least for questions in algebraic geometry), I would recommend Bergman (http://servus.math.su.se/bergman/).
10 votes
2 answers
214 views

Degree 8 multilinear operations on Jordan algebras

I am interested in the dimension, or, even better, in the $S_8$-module structure of the space of degree 8 multilinear operations on Jordan algebras. Recall that a Jordan algebra is a commutative but n …
Vladimir Dotsenko's user avatar
1 vote

Degree 8 multilinear operations on Jordan algebras

I managed to run Albert on a very powerful computer at work, and the computation of the desired dimension converged: it seems equal to 19089. I would very much like to confirm that it is correct (I am …
Vladimir Dotsenko's user avatar
56 votes
Accepted

Minimal polynomial of cos(π/n)

The minimal polynomial of $\cos(2\pi/n)$ (by William Watkins and Joel Zeitlin, The American Mathematical Monthly Vol. 100, No. 5 (May, 1993), pp. 471-474) has full clarity on this matter (just take th …
Vladimir Dotsenko's user avatar