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Modulus / Absolute Value

• To: mathgroup at smc.vnet.net
• Subject: [mg90058] Modulus / Absolute Value
• From: Felipe Mannshardt <vexie.infamous at googlemail.com>
• Date: Fri, 27 Jun 2008 06:19:07 -0400 (EDT)

Greetings,

i have been searching the way to tell Mathematica to use Modulus / Absolute Value.  I have been unable to find.

LATEX
\left(\int_0^{\frac{\pi }{2}} f[x] \, dx+\int_{\frac{\pi }{2}}^{\pi } f[x] \, dx\right)+\int_0^{\pi } g[x] \, dx
/LATEX
>
I should be subtracting the upper Integral from the lower Integral,
but since i could not find a way to tell Mathematica to use Modulus /Absolute Value.  I had to add the upper to the lower . . .

my functions are, f and g

LATEX
f[\text{x$\_$}]\text{:=}\text{Sin}[2*x]g[\text{x$\_$}]\text{:=}x^2-(\pi *x)
/LATEX
>
So, can some1 help me out with this one? How to use Modulus/Absolute Value (German, Betrag) with Mathematica.

• Follow-Ups:
  • Re: Modulus / Absolute Value
    • From: Murray Eisenberg <murray@math.umass.edu>