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MathGroup Archive 2010

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FullForm puzzle.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106248] FullForm puzzle.
  • From: Jack L Goldberg 1 <jackgold at umich.edu>
  • Date: Wed, 6 Jan 2010 05:59:29 -0500 (EST)

I wonder why two apparently identical output forms have different FullForms.

(1)  FullForm[ 2<= x< =3] returns LessEqual[2,x,3]

while

(2) Reduce[ 2<=x && x<=3 ] returns 2 <= x <= 3 whose FullForm is
Inequality[2,LessEqual,x,LessEqual,3].

Any thoughts?

Jack


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