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We define

mult: R_{ != 0}xR_{ != 0}->R_{ != 0}mult( x,y) :=x*y

For all real numbers `x` != 0, `y` != 0, we have

mult( x,y)/y=x.

However, we do *not* know the value of

mult(0,therefore we musty)

Author: Wolfgang Schreiner

Last Modification: October 14, 1999