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Imagine an audience of readers who know rather little about functional analysis but whose interest in that subject might be piqued by an exposition of its uses in differential and integral equations.

Does such an expository article exist?

Some textbooks on functional analysis do not hint that a major raison d'être of the subject is its use in the study of differential and integral equations. The reader could go all the way through without finding that out.

Probably an expository paper could remedy that deficiency.

Imagine an audience of readers who know rather little about functional analysis but whose interest in that subject might be piqued by an exposition of how it is useful in differential and integral equations.

Does such an expository article exist?