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greisen

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I am using the book "Advanced Engineering Mathematics" by Erwin Kreyszig where I am reading on the transformation of coordinates - when changing from \int f(x,y) to \int f(v(x,y),v(x,y) it is necessary to multiply with the size of the jacobian, |J| - I cannot find the proof in the book and I don't quite understand why one should multiply with this?

Any help or advise where to locate the proof in order to better understand the multiplication with the Jacobian.

Thanks in advance

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