MapThread for any combination of variables - wolfram-mathematica

Question

I have a set of regular (mod 5) matrices N2 and I would like to get the group generated by these matrices in Mathematica:
My approach was to use a function f doing the matrix multiplication and g for mod 5 and then I wanted to use MapThread
M= Function[{x,y},x.y];
g = Function[z, Mod[z, 5]]
g /# MapThread[M, {N2,N2}]
The problem is that MapThread is inserting only pairs of elements that are at the same position in the lists. I would like to insert any pair of elements in N. To get the group generated by the matrices in N I would just repeat this and update N2 every time.
E.g. let N2 ={A,B}
g /# MapThread[M, {N2,N2}]
would return {B^2,A^2}, while I want it to return any product of matrices in N2, i.e. {A^2,AB,BA,B^2}.

Answer 1

I'm not sure whether I understand your question, but if your intention is to get all combinations of the two matrices A,B you could use Tuples combined with Apply (which you may use in its functional form with square brackets or as many here do in initially cryptic prefix operator form ### = Apply at level 1):
In[24]:= Dot ### Tuples[{A, B}, 2]
Out[24]= {A.A, A.B, B.A, B.B}

Answer 2

In this case you need Outer:
In[27]:= n = RandomInteger[{1, 5}, {3, 2, 2}];
In[28]:= Outer[mFunc, n, n, 1]
Out[28]= {{mFunc[{{3, 5}, {2, 4}}, {{3, 5}, {2, 4}}],
mFunc[{{3, 5}, {2, 4}}, {{3, 4}, {4, 3}}],
mFunc[{{3, 5}, {2, 4}}, {{4, 4}, {5, 1}}]}, {mFunc[{{3, 4}, {4,
3}}, {{3, 5}, {2, 4}}],
mFunc[{{3, 4}, {4, 3}}, {{3, 4}, {4, 3}}],
mFunc[{{3, 4}, {4, 3}}, {{4, 4}, {5, 1}}]}, {mFunc[{{4, 4}, {5,
1}}, {{3, 5}, {2, 4}}],
mFunc[{{4, 4}, {5, 1}}, {{3, 4}, {4, 3}}],
mFunc[{{4, 4}, {5, 1}}, {{4, 4}, {5, 1}}]}}
In[29]:= n
Out[29]= {{{3, 5}, {2, 4}}, {{3, 4}, {4, 3}}, {{4, 4}, {5, 1}}}