Abstract
It is proved that the Disc Algebra does not contain a complemented subspace isomorphic to the space $C_{(k)}(T^d) of $k$ times continuously differentiable functions on the $d$-dimensional torus $(k = 1,2,...; d = 2,3,...)$.
Information
It is proved that the Disc Algebra does not contain a complemented subspace isomorphic to the space $C_{(k)}(T^d) of $k$ times continuously differentiable functions on the $d$-dimensional torus $(k = 1,2,...; d = 2,3,...)$.