4 The theory of 
-sets
-sets of reals are endowed with rich structural properties, including those that are best understood from the perspective of the constructible universe L. In this chapter a deeper analysis of such sets is presented to elucidate this point.
4.1 A 
-basis theorem
4.1.1 Tree presentations for 
-sets
Recall that given a -set A ⊆ 2ω, there ...
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