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disable canceling

• To: mathgroup at smc.vnet.net
• Subject: [mg106465] disable canceling
• From: Petr Martinec <petr.martinec at gmail.com>
• Date: Wed, 13 Jan 2010 06:00:06 -0500 (EST)

Hi all,
is here posibility to prevent canceling in Mathematica? I need it to
work with transfer and contreller functions (dynamic system theory). I
would like to input like this

g[s] = s (s + 1)/((s + 1) (s + 2));

and after evaluation get same expression. Another situation is:

input:

g[s] = s (s + 1)/(s + 2);
c[s] =1/(s(s + 1));
l[s] = g[s] c[s]

output:
l[s] = s(s + 1)/(s(s + 1)(s + 2))

It is possible to get this result?

thanks for your answers.