If I have an integral:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] A = \int \frac{d^d p}{(2 \pi)^d} Z[p][/tex]

And I want [tex] A^* A [/tex]

Is it

[tex] A^* A = \int \frac{d^d p}{(2 \pi)^d} Z^*[p] Z[p] [/tex] ?

Because the "p" is the same, and really it would be integral 1 times integral 2 times a delta, which should make it just one.

I don't think its true, and an example in mathematica doesnt work.

Is there a shortcut to get the product of two integrals to be one?:

[tex](\int \frac{d^d p}{(2 \pi)^d} Z^*[p])( \int \frac{d^d p}{(2 \pi)^d} Z[p]) =[/tex]

hmm, the product of two sums...

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# Product of two integrals

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