# Tagged Questions

Questions on the group-theoretic functionality of Mathematica.

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### How to split a SymmetricGroup into some PermutationGroup with smaller GroupOrder

Background I want to get a permutation list, so I use the SymmetricGroup(or use Permutations) to produce it when the ...
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### Irreducible representations for the symmetry group $T_d$

I am trying to get the explicit two dimensional irreducible representation matrices for the symmetry group $T_d$. I need the matrix representation for each element in the group. Are there any ...
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### How the solve the parameter of the conjugate permutations

As we know the definition of conjugate permutations is: $$\exists p \quad p^{-1} \alpha p=\beta$$ When I have an alpha=Cycles[{{1,4},{2,5,6,3}}] and a ...
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### how to get a constant value by mathematica?

I'm anew user of mathematica ,, forgive me A.B - B.A = 2Ιf C and c = {{0, 0, 0}, {0, 0, -Ι}, {0, Ι, 0}}; I is imaginary number, f is a constant and equal (1/2) How to get the value of f by ...
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### Counting automorphisms that preserve a group action

Note: the math, I believe, is not the problem here. The issue is not that I get the wrong answer, just that my code does not terminate. So, if you do not feel comfortable with the problem below, I do ...
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### Normal subgroups, Group order, Automorphisms

I am a beginner at Mathematica and have a few problems. Find all normal subgroups of the Alternating Group A[4]. Find the order of a group Aut(U[8]). Find the group Aut(S[3]). I've been trying to ...
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### Calculating in the group ring $Q[GL_n(Z)]$

I am trying to use Mathematica to check some identities in the group ring $Q[GL_n(Z)]$. Is there a package/function of Mathematica to do this? Thanks a lot in advance!
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### Any command for group products?

Is there any Mathematica command or well known technique to take the direct product between two symmetric/permutation groups?
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### Counting the permuted forms of a list with repeated members under a permutation group

DeleteDuplicates[Permute[{g, g, g, g, g, e, r}, AlternatingGroup[7]]] How to count number of lists automatically?
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### How does GroupActionBase affect the order of elements in a group?

Related (math.SE): How does the base of a group determine the “sort” of the elements in the group The help page for GroupActionBase says: A base of a group ...
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### Package for representation of groups (group theory)

I wanted to know if there is a package which allows to compute representations of a group like the definition representation, adjoint and so on (for example the Pauli matrix for $SU(2)$ if I specify ...
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### How to distribute PermutationProduct over the sum

Assuming I have two elements of the permutation group algebra $a_1$, $a_2$ such that $a_i=\sum_{p\in S_n}\alpha_pp$, I want to define a linear product $\odot$ that distributes over the sum and pulls ...
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### What is the underlying algorithm for GroupElementToWord?

What algorithm is Mathematica 9 using for GroupElementToWord[group, g]?
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### Defining a non-commutative operator algebra in Mathematica

I am trying to develop a function(s) to do some commutator algebra to compute the enveloping algebra and ideals of a Lie algebra. For example if I have $SU(2)$ algebra generated by $L_i$ ($i=1,2,3$), ...
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### How to generate a matrix group?

I have three $7\times 7$ matrices (with real entries, lots of zeros) and I'd like to check if they generate a finite group (or, more precisely, if the group they generate is of precise order). Would ...
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### Symmetry-finding packages

Where can I find the most up-to-date or whatever you consider to be the most useful symmetry-finding package for differential equations? I do not intend to restrict to, but would like to include those,...
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### Plotting All Possible Points Belonging to a Group Orbit

Given that $$X = \{(x,y,z) \in \mathbb{R}^3 |\, x^2 + y^2 + z^2 - 2(xy + xz + yz) = k\}\,,$$ where $k$ is a constant. Also given that a group $G$ is represented by \langle g_1,g_2,g_3|\, g_1^2 = g_2^...
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### How can I compute the representation matrices of a point group under given basis functions?

Take the $C_{3v}$ point group for example: ...
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### Standardizing a coset table via matrix manipulation

Suppose we have a group $G$ and a subgroup $H$. A coset table encodes the permutation representation of $G$ on the right cosets of $H$. When we want to use these coset tables in calculations, it is ...
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### Finding elementary cycles of (directed) graphs

I need to enumerate all the simple cycles (i.e. elementary cycles where no vertex is repeated other than the starting) of a graph which has both directed and undirected edges, where we can treat the ...
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### What is the command to find function invariant?

What is the command to find function invariant? http://demonstrations.wolfram.com/AFunctionInvariantUnderAGroupOfTransformations/ what is algorithm it use to calculate this? Edit there is a book ...