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Factorisation in nest algebras
Authors:M Anoussis  E G Katsoulis
Institution:Department of Mathematics, University of the Aegean, Karlovassi 83200, Greece

E. G. Katsoulis ; Department of Mathematics, East Carolina University, Greenville, North Carolina 27858

Abstract:We give a necessary and sufficient condition on an operator $A$ for the existence of an operator $B$ in the nest algebra $\operatorname {Alg} \,N$ of a continuous nest $N$ satisfying $AA^*=BB^*$ (resp. $A^*A=B^*B)$. We also characterise the operators $A$ in $B(H)$ which have the following property: For every continuous nest $N$ there exists an operator $B_N$ in $\operatorname {Alg} \,N$ satisfying $AA^*=B_NB_N^*$ (resp. $A^*A=B_N^*B_N)$.

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