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Modules with Non-Cyclic Socle and the Extension Property

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arxiv 2010.08343 v1 pith:WR466VAX submitted 2020-09-26 math.RA

Modules with Non-Cyclic Socle and the Extension Property

classification math.RA
keywords propertyextensionsocleweightcyclicprovedsatisfyingalphabets
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In 2009, J. Wood proved that Frobenius bimodules have the extension property for symmetrized weight compositions. More generally, it was later shown that having a cyclic socle is sufficient for satisfying the property, while the necessity remained an open question. In this thesis, a partial converse is proved. For a significant class of finite module alphabets, the cyclic socle condition is shown necessary for satisfying the extension property. The idea is to use a new weight function to return to the original case of Hamming weight.

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    The MacWilliams extension theorem fails for stabilizer codes at every qudit dimension; for qubits the minimal counterexample lives at length 3 and is essentially unique, with minimal full-support counterexamples at le...