# Integrating over a delta function

1. Nov 15, 2009

### raisin_raisin

Hello,
I have just integrated over one variable, x and have now got a delta function
$$\delta(m)$$

where m = constant * (s-s')

now I have to integrate over either s or s' but I am a bit confused
since if I integrate over say s then the delta function depends on s.

Hope I have explained clearly enough, thanks for reading.

2. Nov 16, 2009

### clamtrox

$$\int ds \delta(s-s') f(s) = f(s').$$

Notice too that there is no constant there, so you have to get rid of it first.

3. Nov 16, 2009

### raisin_raisin

Thank you very much.

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