Re: Integrating DiracDelta in Mathematica: how to suppress

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• Subject: [mg128346] Re: Integrating DiracDelta in Mathematica: how to suppress
• From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
• Date: Tue, 9 Oct 2012 00:35:47 -0400 (EDT)
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```For the integral shown below, how do I get Mathematica to output only the "correct" answer as 1
(for future steps in the notebook) and i.e. have Mathematica NOT OUTPUT the ConditionalExpresssion
that q2 is real etc?

In[5]:= Integrate[DiracDelta[p - q2], {p, -Infinity, Infinity}]

Out[5]:= ConditionalExpression[1, q2 \[Element] Reals]

Try this:

Integrate[DiracDelta[p - q2], {p, -Infinity, Infinity},
Assumptions -> {p \[Element] Reals && q2 \[Element] Reals}]

1

Have fun, Alexei

Alexei BOULBITCH, Dr., habil.
IEE S.A.
ZAE Weiergewan,
11, rue Edmond Reuter,
L-5326 Contern, LUXEMBOURG

Office phone :  +352-2454-2566
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mobile phone:  +49 151 52 40 66 44

e-mail: alexei.boulbitch at iee.lu

```

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