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Open Problems in Reverse Mathematics

Stephen G. Simpson
Department of Mathematics
Pennsylvania State University

December 15, 1999

The basic reference for reverse mathematics is my recently published book Subsystems of Second Order Arithmetic [32]. The web site for the book is This article is a write-up of some representative open problems in reverse mathematics. It was originally a handout for my 45-minute invited talk at the AMS-INS-SIAM conference Computability Theory and Applications, June 13-17, 1999, Boulder, Colorado.


Stephen G Simpson