Simplify UnitStep expressions

*To*: mathgroup at smc.vnet.net*Subject*: [mg69195] Simplify UnitStep expressions*From*: "L. Dwynn Lafleur" <lafleur at louisiana.edu>*Date*: Fri, 1 Sep 2006 06:41:43 -0400 (EDT)*Organization*: University of Louisiana at Lafayette*Sender*: owner-wri-mathgroup at wolfram.com

The following is transcribed from a Mathematica 5.2 notebook in Windows XP: In[1]:= Simplify[UnitStep[a-x/b], a-x/b > 0] Out[1]= 1 In[2]:= Simplify[UnitStep[a-Pi/b], a-Pi/b > 0] Out[2]= UnitStep[a-Pi/b] Why does the second output different from the first? I know it has something to do with the fact that Pi is internally defined in Mathematica because a similar result occurs Pi is replaced with E, but what logic is being followed? -- ====================================== L. Dwynn Lafleur Professor of Physics University of Louisiana at Lafayette lafleur at louisiana.edu ======================================

**Follow-Ups**:**Re: Simplify UnitStep expressions***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>