Books

1. A First Course in Geometric Topology and Differential Geometry, Birkhäuser, Boston, 1996.  publisher's information
2. Proofs and Fundamentals: A First Course in Abstract Mathematics, Birkhäuser, Boston, 2000.  publisher's information
3. The Real Numbers and Real Analysis, to be published by Springer Verlag in 2009.

Papers

4. (with R. Connelly and D. W. Henderson) The space of simplexwise linear homeomorphisms of a convex 2-disk, Topology 23 (1984), 161-175.  pdf
5. Simplexwise linear near-embeddings of a 2-disk into R², Trans. Amer. Math. Soc. 288 (1985), 701-722.  pdf
6. Strictly convex simplexwise linear embeddings of a 2-disk, Trans. Amer. Math. Soc. 288 (1985), 723-737.  pdf
7. Simplexwise linear near-embeddings of a 2-disk into R², II, Topology Appl. (1987), 93-101.  pdf
8. Simplexwise linear and piecewise linear near self-homeomorphisms of surfaces, Fund. Math. 132 (1989), 151-162.  pdf
9. Complexes whose boundaries cannot be pushed around, Discrete Comput. Geom. 4 (1989), 365-374.
10. A combinatorial Chern-Weil theorem for 2-plane bundles with even Euler characteristic, Israel J. Math. 67 (1989), 193-216.
11. The angle defect for arbitrary polyhedra, Beitrage Algebra Geom. 39 (1998), 379-393.
12. Critical points and the angle defect, Geom. Dedicata 109 (2004), 121-137.  pdf
13. The angle defect for odd-dimensional simplicial manifolds, Discrete Comput. Geom. 35 (2006), 311-328.  pdf
14. Mod 2 degree and a generalized no retraction theorem, Math. Nachr. 279 (2006), 490-494.  pdf
15. A simple proof of a generalized no retraction theorem, to appear in Amer. Math. Monthly.  pdf
16. A characterization of the angle defect and the Euler characteristic in dimension 2, to appear in Discrete Comput. Geom.  pdf
17. Polyhedral representation of discrete Morse functions on regular CW complexes and posets, in preparation.  pdf