Re: Help to define linked domains for variables

*To*: mathgroup at smc.vnet.net*Subject*: [mg98244] Re: Help to define linked domains for variables*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Fri, 3 Apr 2009 04:38:23 -0500 (EST)*References*: <gr21ji$loe$1@smc.vnet.net>

Not sure if I understood the problem. You can write the relations as follows (assuming you forgot some quotes): \[CurlyEpsilon] = \[Piecewise] { {-1, z < 0}, {0, z == 0}, {1, z > 0} } \[CurlyEpsilon]' = \[Piecewise] { {-1, r $B!](B a < 0}, {0, r $B!](B a == 0}, {1, r $B!](B a > 0} } I uppose there is something you want to solve here, but you have to make yourselve a bit clearer. Cheers -- Sjoerd On Apr 2, 11:47 am, Shay Reboh <shayre... at gmail.com> wrote: > 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