The convolution operation on the spectra of algebras of symmetric analytic functions

We show that the spectrum of the algebra of bounded symmetric analytic functions on ℓp,1≤p<+∞ with the symmetric convolution operation is a commutative semigroup with the cancellation law for which we discuss the existence of inverses. For p=1, a representation of the spectrum in terms of entire functions of exponential type is obtained which allows us to determine the invertible elements.