23 citations · 120 across the 33 of their papers we have counts for
39 papers
Predual and tight operator systems
Chi-Keung Ng, Xin-Rui Tan
Given a (not necessarily unital) complete operator system with a generating cone, there are some studies in literature on the operator system dual of , i.e.,…
Duality for operator systems with generating cones
Yu-Shu Jia, Chi-Keung Ng
Let be a complete operator system with a generating cone; i.e. $S_\sa = S_+ - S_+$. We show that there is a matrix norm on the dual space , under which, and the usual dual…
Non-unital operator systems that are dual spaces
Yu-Shu Jia, Chi-Keung Ng
We will give an abstract characterization of an arbitrary self-adjoint weak-closed subspace of (equipped with the induced matrix norm, the induced matrix cone…
Quantum sets and Gelfand spectra (Ortho-sets and Gelfand spectra)
Chun Ding, Chi-Keung Ng
Motivated by quantum states with zero transition probability, we introduce the notion of ortho-set which is a set equipped with a relation satisfying: $x\neq_\mat…
Dual spaces of operator systems
Chi-Keung Ng
This article is to give an infinite dimensional analogue of a result of Choi and Effros. We say that an (not necessarily unital) operator system is \emph{dualizable} if one can…
Coarse metric and uniform metric
Chi-Keung Ng
We introduce the notion of coarse metric. Every coarse metric induces a coarse structure on the underlying set. Conversely, we observe that all coarse spaces come from a particular…