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pro vyhledávání: '"Jun Tomiyama"'
Autor:
Jun Tomiyama, Kôtarô Tanahashi
Publikováno v:
Canadian Mathematical Bulletin. 31:308-317
We prove that Choi's map in M3 cannot be written as the sum of a 2-positive map and a 2-copositive map. We also provide other examples of positive maps in Mn which cannot be written as the sum of an n-positive map and a 2-copositive map.