Help to define linked domains for variables

*To*: mathgroup at smc.vnet.net*Subject*: [mg98198] Help to define linked domains for variables*From*: Shay Reboh <shayreboh at gmail.com>*Date*: Thu, 2 Apr 2009 04:47:36 -0500 (EST)

I am a very basic user of Mathematica and I have found the following problem. I have a function where I need to define for the variable $B&E(B, $B&E!l(B and z the following relations $B&E(B = $B!](B1 if z < 0; $B&E(B = 0 if z = 0; $B&E(B = 1 if z > 0 $B&E!l(B = $B!](B1 if r $B!](B a < 0; $B&E(B = 0 if r $B!](B a = 0; $B&E(B = 1 if r $B!](B a > 0 Thanks in advance for any help Shay