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MathGroup Archive 1995

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How to set Sign of expression?

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1595] How to set Sign of expression?
  • From: keeton at husc.harvard.edu (Charles Keeton)
  • Date: Mon, 3 Jul 1995 03:46:05 -0400
  • Organization: Harvard University, Cambridge, Massachusetts

Hi.  I want to set the Sign of an expression.  For example, suppose
I know a is restricted to the range 0 < a < 1; then I know 1-a > 0.
How do I tell Mathematica this?  I have tried

  Sign[1-a]^=1

and

  a /: Sign[1-a]=1

but Mathematica frowns on both.  Any ideas?

Thanks in advance,
Chuck



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