Properties of Multiplication Operators on Köthe spaces

We make an exhaustive study of the properties of multiplication operator $M_u$ acting on Köthe spaces. We characterize the multiplication operators, acting on Köthe spaces, which are: bounded, injective, onto, bijective, Fredholm, compact, with closed range and with range finite. We also study the spectrum, the $n$-power and calculate the essential norm of $M_u$ and we study the algebra of multiplication operators.

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