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Commutative H∗-algebra is characterized in a somewhat unusual fashion without assuming either Hilbert space structure or commutativity. Existence of an involution is not postulated also

international journal of mathematics and mathematical sciences

Another version of “exotic characterization of a commutative<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$H^\ast$"><mml:msup><mml:mi>H</mml:mi><mml:mo>∗</mml:mo></mml:msup></mml:math>-algebra”

Another version of “exotic characterization of a commutativeH∗-algebra”