Maximal triangular subalgebras need not be closed

Poon, Yiu Tung

doi:10.1090/S0002-9939-1991-1034888-5

Maximal triangular subalgebras need not be closed
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Proc. Amer. Math. Soc. 111 (1991), 475-479 Request permission

Abstract:

We give an example to show that a maximal triangular subalgebra need not be closed.

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