Let *A* be a real commutative Banach algebra with unity. Let *a_0\in A\setminus\{0\}*. Let *\mathbb Z a_0:=\{na_0\}_{n\in \mathbb Z}*. Then, *\mathbb Z a_0* is a discrete subgroup of *A*. For any *n\in \mathbb Z*, the Frechet derivative of the mapping x \, \in \, A \ \ \ \mapsto \... Show more

October 8, 2019

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

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