= Compact operator
{wiki=Compact_operator}
In functional analysis, a compact operator is a specific type of linear operator that maps elements from one Banach space to another (or possibly to the same space) with properties similar to those of compact sets in finite-dimensional spaces. The concept of compact operators is crucial in the study of various problems in applied mathematics, quantum mechanics, and functional analysis. \#\#\# Definition Let \\( X \\) and \\( Y \\) be two Banach spaces.
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