The Sequential Product of Quantum Effect
Chunfang Shao · Journal of Ankang University · 2009
For every A,B or A,B P(H),we defined the sequential product of A,B by AB= ABA.The main purpose of this article is to investigate some of the algebraic properties about the sequential product of quantum effect.Put some algebraic conditions on AB imply that A and B commute for the usual operator product.The result which S.Gudder got in(4),we give a wholely new proof by the technique of block operator matrix which makes the geometry structure of operators more clear.