#fast-growing_hierarchy

Fast-growing hierarchy

Ordinal-indexed family of rapidly increasing functions: ℕ→ℕ

In computability theory, computational complexity theory and proof theory, a fast-growing hierarchy is an ordinal-indexed family of rapidly increasing functions fα: N → N. A primary example is the Wainer hierarchy, or Löb–Wainer hierarchy, which is an extension to all α < ε0. Such hierarchies provide a natural way to classify computable functions according to rate-of-growth and computational complexity.

Sat 24th

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