Problems of fuzzy arithmetic
		
                      Zdenek Zabokrtsky

                          FEL CVUT

In the standard arithmetic of fuzzy numbers, the vagueness of fuzzy
quantities always increases. Klir suggests an
alternative---constrained fuzzy arithmetic---which reduces this
effect. Little attention was paid to the problems of implementation of
constrained fuzzy arithmetic, especially to its computational
efficiency. We point out the related problems and outline the ways of
their solution.