Untitled - Cdm.unimo.it

92 Polynomial Approximation of Differential Equations
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From the point of view of functional analysis, the brief presentation set forth in these
pages is far from exhaustive. In our opinion, however, it contains sufficient material for
an in depth understanding of the applications that follow. We refer the readers that are
more concerned with theoretical issues, to the numerous publications in this field. Very
attractive to applied mathematicians are, for instance, the text of brezis(1983) and
the introductory essay of brezzi and gilardi(1987), where the functional spaces are
rigorously treated, but without the tiresome formalism of the more specialized books.