A remark on embedding of a cylinder on a real commutative Banach algebra

Hiroki Yagisita

Let $A$ be a real commutative Banach algebra with unity. Let $a_0\in A\setminus \{0\}$. Let $\mathbb{Z}{a}_0:=\{n{a}_0{\}}_{n\in \mathbb{Z}}$. Then, $\mathbb{Z}{a}_0$ is a discrete subgroup…