A note on star partial order preservers on the set of all variance-covariance matricesDolinar, Gregor (Avtor) Kuzma, Bojan (Avtor) Marovt, Janko (Avtor) Mosić, Dijana (Avtor) preserverstar partial orderlinear modelvariance-covariance matrixLet $H_n^+(\mathbb{R})$ be the cone of all positive semidefinite $n \times n$ real matrices. We describe the form of all surjective maps on $H_n^+(\mathbb{R})$, $n ≥ 3$, that preserve the star partial order in both directions.20232023-06-27 15:23:02Članek v reviji147240UDK: 512.643:517.983ISSN pri članku: 0139-9918DOI: 10.1515/ms-2023-0022COBISS_ID: 143109123sl