       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

```

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