Посилання:On NSP constants of a matrix and their linear preservers / M. Skrzyński // Algebra and Discrete Mathematics. — 2019. — Vol. 28, № 2. — С. 278–290. — Бібліогр.: 9 назв. — англ.
We collect some basic properties of NSP constants of a matrix, discuss an additive behavior of the spark, and prove two theorems characterizing linear endomorphisms which preserve the NSP constants.