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:
“We love the indomitable bellicose patriotism that sets you apart; we love the national pride that guides your muscularly courageous race; we love the potent individualism that doesn’t prevent you from opening your arms to individualists of every land, whether libertarians or anarchists.”
—Tommaso Marinetti (1876–1944)