On minimal codes arising from projective embeddings of point-line geometries
Provides a unified theoretical framework to prove minimality for several families of linear codes, which is of interest to coding theorists.
The paper proves that projective codes arising from certain point-line geometries are minimal if a connectivity condition holds, and applies this to show that Grassmann codes, Segre codes, polar Grassmann codes, and point-hyperplane codes are minimal.
Let ${\mathcal C}(Ω)$ be the linear code arising from a projective system $Ω$ of $\mathrm{PG}(V).$ Consider the point-line geometry $Γ=({\mathcal P},{\mathcal L})$ and a projective embedding $\varepsilon\colon Γ\rightarrow \mathrm{PG}(V)$ of $Γ.$ We show that the projective code obtained by taking as projective system $Ω:=\varepsilon(\mathcal{P})$ is minimal if the graph induced on the set $Γ\setminus\varepsilon^{-1}(H)$ by the collinearity graph of $Γ$ is connected for any hyperplane $H$ of $\mathrm{PG}(V)$. As an application, Grassmann codes, Segre codes, polar Grassmann codes of orthogonal, symplectic, hermitian type and codes arising from the point-hyperplane geometry of a projective space are minimal codes.