
Classfying quadrilaterals
Posted:
Jan 11, 1995 6:43 AM


I have not completely followed the discussions about quadrilaterals and their symmetry so I apologize if I raise an issue that has already been noted. In the early discussion I saw, the assumption was being made that a quadrilateral was plane, convex. There are also interesting issues that come up when one allows nonconvex plane quadrilaterals and plane but selfintersecting quadrilaterals. Furthermore, not all quadrilaterals need be plane. There are new ideas and problems to be explored in these cases.  JOE MALKEVITCH DEPT. OF MATH. YORK COLLEGE (CUNY) JAMAICA, NY 11451 EMAIL: JOEYC@CUNYVM OR JOEYC@CUNYVM.CUNY.EDU PHONE: 7182622550 (2551)

