نتایج جستجو برای: h space
تعداد نتایج: 997343 فیلتر نتایج به سال:
Journal:
Bulletin of the Iranian Mathematical Society
2017
In this paper, we characterize the class of orthogonality preserving operators on an infinite-dimensional Hilbert space $H$ as scalar multiples of unitary operators between $H$ and some closed subspaces of $H$. We show that any circle (centered at the origin) is the spectrum of an orthogonality preserving operator. Also, we prove that every compact normal operator is a strongly orthogo...
Journal:
:Proceedings of the American Mathematical Society
1999
Journal:
:Bulletin of the Brazilian Mathematical Society, New Series
2009
Journal:
:Transactions of the Society of Instrument and Control Engineers
1991
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