Date of this Version
The following notes rework a discussion due to Kevin Kelly on the application of topological notions in the context of learning (see Kelly (1990)). All the results except for (2), (4) and (9) are due to Kelly, but are proved differently.
Daniel N. Osherson and Scott Weinstein, "Notes on Hierarchies and Inductive Inference", . May 1990.
Date Posted: 23 August 2007