1. Noncommutative geometry and Matrix theory
2. Why Is the Matrix Model Correct?
3. D-branes and the noncommutative torus
4. C. Hofman, E. Verlinde, U-duality of Born–Infeld on the non-commutative two-torus, hep-th/9810116.
5. N. Seiberg, talk given at the Conference New Ideas in Particle Physics and Cosmology, Univ. Penn., May 19-22, 99; transpancies available at http://dept.physics.upenn.edu/particle_meeting/seiberg.html.