In mathematics, a nuclear space is a topological vector space with many of the good properties of finite-dimensional vector spaces. The topology on them can be defined by a family of seminorms whose unit balls decrease rapidly in size. Vector spaces whose elements are "smooth" in some sense tend to be nuclear spaces; a typical example of a nuclear space is the set of smooth functions on a compact manifold. Although important, nuclear spaces are not widely used, possibly because the definition is notoriously difficult to understand.
Much of the theory of nuclear spaces was developed by Alexander Grothendieck and published in (Grothendieck 1955).
Read more about Nuclear Space: Definition, Examples, Properties, Bochner–Minlos Theorem
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