Concerning the Dilations of Bounded Operators in Hilbert Space
Received:December 09, 1980  
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Wu Zhiquan Jilin University 
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Abstract:
      The concept of dilation of bounded operator in Hilbert space introduced by Sz.-Nagy is useful for the operator researches. The main purpose of this note is to give a necessary and sufficient condition for an operator to be a dilation of a bounded operator A and then to distinguish the dilations of an operator into two kinds, exact and unexact dilations, by means of this condition. When we are only concerned with unitary dilations, the concept of exact dilation being nothing but that of minimal unitary dilation. Most of the other results stated in this note may be well known, but have been stated and proved in a new form.
Citation:
DOI:10.3770/j.issn:1000-341X.1981.01.016
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