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Physical & Biological Sciences Division

Mathematics Department

Distinguished Professor

Faculty

Regular Faculty

McHenry Library

McHenry Building #4157

Mathematics Department

B.A. Queens College, City University of New York

M.A., Ph.D., University of Michigan

Professor Cooperstein’s research covers several areas related to groups of Lie type, finite group theory, Galois geometry and, more generally, incidence geometry. By incidence geometry is meant a pair (P,L) consisting of a set P whose members are called points, and a collection L of distinguished subsets of P whose members are called lines. Projective planes (more generally projective space) and generalized quadrangles are examples. Recently he has become interested in the “embeddings” of such geometries - ways in which these geometries can be modeled by point sets in projective space together with some full projective lines. In particular, he is interested in finding the largest - universal - such embeddings and has achieved results for many of the Lie incidence geometries.

A related problem that interests Professor Cooperstein concerns characterizing the maximal external subspaces which do not contain any points of various point sets in finite projective space - so called maximal external flats. Such spaces can be used to construct caps on varieties, error-correcting codes, and other combinatorial objects. Another problem which animates Cooperstein’s interest is the possible non-existence of ovoids on hyperbolic quadric in ten (linear dimensions). Another problem that he has undertaken is the characterization of apartments in the shadow geometries of spherical buildings.

- B. Cooperstein: (With A. Cohen): Lie Incidence Systems viewed as Intersections of Quadrics. Proceedings of the American Mathematical Society, volume 126, number 7 (July 1998), 2095-2102.
- B. Cooperstein: On a Connection Between Hyperbolic Ovoids on the Hyperbolic Quadric Q (10,q) and the Lie Incidence Geometry E6,1(q), 55-64 in Groups and Geometries, Birkhauser, 1998.
- B. Cooperstein: On the Generation of Dual Polar Spaces of Unitary Type Over Finite Fields. European Journal of Combinatorics 18 (1997), no.8, 849-856.
- B. Cooperstein: External Flats to Varieties in PG(Mn,n(GF(q)). Linear Algebra and Its Applications, 267 (1997), 175-186.
- B. Cooperstein: On the Generation of Some Dual Near Polygons of Symplectic Type Over GF(2). European Journal of Combinatorics 18 (1997), no. 7, 741-749.

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