R. Rupp

activity

20092016

H^{\infty} (Ω)

for Circular Domains

Ω

5 citations · 15 across the 9 of their papers we have counts for

collaborators

Showing 2014 · math.FAShow all

2 papers · 2 filters

math.FA2014★ 4 cited

Logarithms and exponentials in Banach algebras

Raymond Mortini, Rudolf Rupp

Let $A$ be a complex Banach algebra. If the spectrum of an invertible element $a \in A$ does not separate the plane, then $a$ admits a logarithm. We present two elementary proofs of…

math.FA2014

The Bass and topological stable ranks for algebras of almost periodic functions on the real line

Raymond Mortini, Rudolf Rupp

Let $Λ$ be a sub-semigroup of the reals. We show that the Bass and topological stable ranks of the algebras $AP_{Λ} = {f \in AP : σ (f) \subseteq Λ}$ of almost periodic funct…