# Double and triple integrals

1. Apr 13, 2005

### Oggy

I understand double and triple integrals and all, but I'm just wondering why is
$$dxdy=|J|dudv\ x=f(u,v)\ y=g(u,v)$$ Where does that derive from? Why is it? (and also for triple integrals)

Last edited: Apr 13, 2005
2. Apr 13, 2005

### matt grime

It comes from considering the area change of an infinitesimal area moving from the xy plane to uv plane

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