Codes defined by forms of degree 2 on Hermitian surfaces and Sørensen's conjecture
Finite Fields and Their Applications
Error-Correcting Codes from Higher-Dimensional Varieties
Finite Fields and Their Applications
Structure of functional codes defined on non-degenerate Hermitian varieties
Journal of Combinatorial Theory Series A
Functional codes arising from quadric intersections with Hermitian varieties
Finite Fields and Their Applications
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We study the functional codes of second order on a non-degenerate Hermitian variety $${\mathcal{X} \subset {\mathbb{P}}^4(\mathbb{F}_q)}$$ as defined by G. Lachaud. We provide the best possible bounds for the number of points of quadratic sections of $${\mathcal{X}}$$ . We list the first five weights, describe the corresponding codewords and compute their number. The paper ends with two conjectures. The first is about minimum distance of the functional codes of order h on a non-singular Hermitian variety $${\mathcal{X} \subset{\mathbb{P}}^4(\mathbb{F}_q)}$$ . The second is about distribution of the codewords of first five weights of the functional codes of second order on a non-singular Hermitian variety $${\mathcal{X} \subset {\mathbb{P}}^N(\mathbb{F}_q)}$$ .