176,483 research outputs found
A real seminorm with square property is submultiplicative
A seminorm with square property on a real associative algebra is
submultiplicativeComment: 3 page
A remark on continuity of positive linear functionals on separable Banach *-algebras
Using a variation of the Murphy-Varopoulos Theorem, we give a new proof of
the following R.J.Loy Theorem: Let A be a separable Banach*-algebra with center
Z such that ZA has at most countable codimension, then every positive linear
functional on A is continuous.Comment: 3 page
Positive linear functionals on BP*-algebras
Let A be a BP*-algebra with identity e, P_{1}(A) be the set of all positive
linear functionals f on A such that f(e) = 1, and let M_{s}(A) be the set of
all nonzero hermitian multiplicative linear functionals on A. We prove that
M_{s}(A) is the set of extreme points of P_{1}(A). We also prove that, if
M_{s}(A) is equicontinuous, then every positive linear functional on A is
continuous. Finally, we give an example of a BP*-algebra whose topological dual
is not included in the vector space generated by P_{1}(A), which gives a
negative answer to a question posed by M. A. Hennings.Comment: This is an English translation of the original article written in
Frenc
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