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MathGroup Archive 2004

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Re: functions

  • To: mathgroup at
  • Subject: [mg45550] Re: functions
  • From: Harold.Noffke at (Harold Noffke)
  • Date: Tue, 13 Jan 2004 04:04:03 -0500 (EST)
  • References: <btps64$bde$>
  • Sender: owner-wri-mathgroup at


Re ...

> But
> g[2.0]
> 0.5
> does not treat 2.0 as rational. Maybe you will get a better answer on this
> part.
> David Park
> djmp at

I think a "better answer" can be had by examining Mathematica 5.0's
ability to remain error free when confronted with cleverly constructed
known irrational expressions, such as the one below, copied from the
Built-In Functions reference for Rationals.

    In[1]:= Element[3^(Sqrt[5]), Rationals]
    Out[1]= False


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