Self-orthogonal flags of codes and translation of flags of algebraic geometry codes
<|reference_start|>Self-orthogonal flags of codes and translation of flags of algebraic geometry codes: A flag $C_0 \subsetneq C_1 \cdots \subsetneq C_s \subsetneq {\mathbb F}_q^n $ of linear codes is said to be self-orthogonal if the duals of the codes in the flag satisfy $C_{i}^\perp=C_{s-i}$, and it is said to satisfy the isometry-dual property with respect to an isometry vector ${\bf x}$ if $C_i^\perp={\bf x} C_{s-i}$ for $i=1, \dots, s$. We characterize complete (i.e. $s=n$) flags with the isometry-dual property by means of the existence of a word with non-zero coordinates in a certain linear subspace of ${\mathbb F}_q^n$. For flags of algebraic geometry (AG) codes we prove a so-called translation property of isometry-dual flags and give a construction of complete self-orthogonal flags, providing examples of self-orthogonal flags over some maximal function fields. At the end we characterize the divisors giving the isometry-dual property and the related isometry vectors showing that for each function field there is only a finite number of isometry vectors and that they are related by cyclic repetitions.<|reference_end|>
@article{bras-amorós2024self-orthogonal,
    title={Self-orthogonal flags of codes and translation of flags of algebraic
  geometry codes},
    author={Maria Bras-Amor'os, Alonso S. Castellanos, Luciane Quoos},
    journal={arXiv preprint arXiv:2406.08952},
    year={2024},
    archivePrefix={arXiv},
    eprint={2406.08952},
    primaryClass={cs.IT math.AG math.IT}
}