This chapter provides necessary preliminaries on functional analysis, comparison results, and the fundamentals of the PME. Section 1.2 provides the basic information on the equation that will serve as background material for the book. The some comparison results are presented. These results are discussed in more detail and the main facts are recalled in Section 1.3, since they are essential in the derivation of the estimates. Additional information is supplied in the appendices at the end.
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