Ralph Kopperman
 Position

Professor Emeritus
 rdkcc@ccny.cuny.edu
 Office
 NAC 6/291A
 Office phone
 (212) 6505125
I am interested in the foundations of general topology, particularly involving spaces in which a point can be in the closure of another, while the other is not in the closure of the first. These spaces have recently had applications in computer science, especially:
digital topology, in which the computer screen (which looks like a rectangle in the plane but has only a finite number of points),
continuous posets, a branch of computer logic, and
approximation of topological spaces by finite spaces.
Teaching
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