Notes:

Funding Information: Acknowledgements: I am grateful for comments and corrections to Hagit Benbaji, Karen Bennett, William Child, Jonathan Gunderson, John Heil, Avishai Margalit, Carl Posy, Carol Rovane, Nick Shea, Ted Sider, Barry Smith, and Levi Spectre. The paper was written during my sabbatical stay at the Center for Philosophy of Science at the University of Pittsburgh. This research was supported by The Israel Science Foundation, grant 857/03-07.