This article contains a characterization of operator systems S with the property that every positive map φ: S → Mn is decompos-able, as well as an alternate and a more direct proof of a characterization of decomposable maps due to E. Størmer. © 2020, University at Albany. All rights reserved.

Sriram Balasubramanian

Department of Mathematics

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

Journal	New York Journal of Mathematics
Open Access	No