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Date: 16-7-2021
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A Fréchet space is a complete and metrizable space, sometimes also with the restriction that the space be locally convex. The topology of a Fréchet space is defined by a countable family of seminorms. For example, the space of smooth functions on is a Fréchet space. Its topology is the C-infty topology, which is given by the countable family of seminorms,
Because in this topology implies that is smooth, i.e.,
any Cauchy sequence has a limit in the space of smooth functions, i.e., it is a complete vector space.
REFERENCES:
Schaefer, H. H. Topological Vector Spaces. New York: Macmillan, 1966.
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