check if a number is rational

• Subject: check if a number is rational
• From: Christian Stengg
• Date: Sat, 15 May 2010 11:57:46 +0200

Dear list,

I want to check if a number is rational. If I use

featurep(2/3, rational);

I get the answer false. Can someone explain this behaviour to me?
(featurep(sqrt(2), real), however, yields true).

Thanks for any help,

Christian

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