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Results tagged with modules
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user 124549
For questions on modules over rings.
3
votes
0
answers
98
views
Dimension of hom spaces between indecomposable modules
$X$ and $Y$ are equivalent to finite direct sums of (not necessarily projective) indecomposable modules. … In particular, are there sets of modules $\{J_a\}, \{J_a^*\}$ "dual" to the set of indecomposable modules $\{I_a\}$ in the sense that
$$dim_k Hom_C(I_a, J_b) = \delta_{ab} = dim_k Hom_C(J_a^*, I_b)? …
- 5,230
1
vote
1
answer
392
views
Making use of extra symmetries; more examples?
seems exclusive for topological compact groups.. therefore the questions:
Questions
What else algebra $A$ has an element that serves as the projection to a given isotypic component for any of its left modules …
- 118k