"Frontier Law: Differential Equations and their Boundary Conditions," P.S.A. 1990, vol. II, edited by Arthur Fine, Micky Forbes and Linda Wessels (E. Lansing: P.S.A. Press,1992).

“The Mathematics of Spilt Milk," in The Growth of Mathematical Knowledge, E. Grosholtz and H. Berger, eds. (Dordrecht: Kluwer, 2000).

"The Unreasonable Uncooperativeness of Mathematics in the Natural Sciences," The Monist 83, 2, 2000.

“Enlarging Ones Stall or How did All of these Sets Get in Here?” Philosophica Mathematica 2013.

“A Second Pilgrim's Progress,” work in progress forthcoming in *Physics Avoidance*.