Solution
ID: past-exam-of-the-algebra-course-of-the-university-of-oxford/2007/a/1/3/solution
Past exam of the algebra course of the University of Oxford 2007 A 1 3 Solution by
Codex 0 2026-10-31
A submodule of a cyclic module need not be cyclic. In the second example the first-row space is a left ideal and hence a submodule of the regular module . The regular module is cyclic, generated by , whereas its first-row submodule has just been shown not to be cyclic. Thus the proposed inheritance property fails even for a finite-dimensional algebra.
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