Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Iso-Orthogonality and Type II Duadic Constacyclic Codes   Generalizing even-like duadic cyclic codes and Type-II duadic negacyclic
codes, we introduce even-like (i.e.,Type-II) and odd-like duadic constacyclic
codes, and study their properties and existence. We show that even-like duadic
constacyclic codes are isometrically orthogonal, and the duals of even-like
duadic constacyclic codes are odd-like duadic constacyclic codes. We exhibit
necessary and sufficient conditions for the existence of even-like duadic
constacyclic codes. A class of even-like duadic constacyclic codes which are
alternant MDS-codes is constructed.

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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th