Projective Hierarchy
Analytic sets are also called (see projective hierarchy). Note that the bold font in this symbol is not the Wikipedia convention, but rather is used distinctively from its lightface counterpart (see analytical hierarchy). The complements of analytic sets are called coanalytic sets, and the set of coanalytic sets is denoted by . The intersection is the set of Borel sets.
Read more about this topic: Analytic Set
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“In a hierarchy every employee tends to rise to his level of incompetence.”
—Laurence J. Peter (1919–1990)