show a/b=c/d is well defined. a/b=a'/b' so ab'=a'b is my first step
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Originally Posted by statman101 show a/b=c/d is well defined. a/b=a'/b' so ab'=a'b is my first step Not sure about that. Without further qualification a/b=c/d is not well defined on R. If b=0 or d=0 the equation is not well defined. But it should be a function that is well defined or not. So you should first be defining a function on R or N or Z.
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