Predual
= Predual
{wiki=Predual}
In mathematics, particularly in functional analysis and the theory of operator algebras, a **predual** refers to a Banach space that serves as the dual space of another space. Specifically, if \\( X \\) is a Banach space, then a space \\( Y \\) is said to be a predual of \\( X \\) if \\( X \\) is isometrically isomorphic to the dual space \\( Y^* \\) of \\( Y \\).