Hyperarithmetical Sets
The central focus of hyperarithmetic theory are certain sets of natural numbers known as hyperarithmetic sets. There are three equivalent ways of defining this class of sets; the study of the relationships between these different definitions is one motivation for the study of hyperarithmetical theory.
Read more about this topic: Hyperarithmetical Theory
Famous quotes containing the word sets:
“There be some sports are painful, and their labor
Delight in them sets off. Some kinds of baseness
Are nobly undergone, and most poor matters
Point to rich ends.”
—William Shakespeare (1564–1616)