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Re: Rational[a,b] vs Rational[1,2]

• To: mathgroup at smc.vnet.net
• Subject: [mg116630] Re: Rational[a,b] vs Rational[1,2]
• From: Richard Fateman <fateman at eecs.berkeley.edu>
• Date: Tue, 22 Feb 2011 04:43:04 -0500 (EST)

On 2/21/2011 6:26 PM, DrMajorBob wrote:
> I think Mathematica expects us to create rationals in the usual way... 
> by dividing integers. When we do, Mathematica removes common factors 
> and can end up with an Integer, a Rational, Indeterminate, or 
> ComplexInfinity.
>
> If you try another method... good luck!
A simple solution is to define Rational[a_,b_] := a/b /;  
Or[Not[IntegerQ[a],IntegerQ[b]]

wouldn't you agree?

RJF