Topological algebra

Topological Algebra

Topological algebra

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In mathematics, a topological algebra A over a topological field K is a topological vector space together with a continuous multiplication

<math>cdot :Atimes A longrightarrow A</math>
<math>(a,b)longmapsto acdot b</math>


that makes it an algebra over K. A unital associative topological algebra is a topological ring.An example of a topological algebra is the algebra C of continuous real-valued functions on the closed unit interval ,or more generally any Banach algebra.

The term was coined by David van Dantzig; it appears in the title of his doctoral dissertation (1931).

The natural notion of subspace in a topological algebra is that of a (topologically) closed subalgebra. A topological algebra A is said to be generated by a subset S if A itself is the smallest closed subalgebra of A that contains S. For example by the Stone–Weierstrass theorem, the set consisting only of the identity function id<sub></sub> is a generating set of the Banach algebra C.






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