Abstract
Let
denote the algebra of all n-times continuously differentiable functions on
which are holomorphic on the unit disc
:
. We prove that
is a Banach algebra with multiplication as Duhamel product
and describe its maximal ideal space. We also describe the commutant and strong cyclic vectors of the integration operator
. Using the Duhamel product we also study the extended eigenvalues and the corresponding extended eigenvectors of the integration operator
.