2 papers
math.FA2019
The minus order for idempotents
Yuan Li, Jiajia Niu, Xiaoming Xu
Let and be idempotents on a Hilbert space The minus order is defined by the equation In this note, we first present some necessary an…
math.FA2018
The minimal and maximal symmetries for -contractive projections
Yuan Li, Xiaomei Cai, Jiajia Niu +1
In this paper, we firstly character the structures of symmetries such that a projection is -contractive. Then the minimal and maximal elements of the symmetries with…