Definition:Multiple Integral/Darboux
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Definition
This page needs proofreading. In particular: Check the terminology used here; I don't know if it is standard. My source just calls this thing the "integral," no mention of Riemann or Darboux. If you believe all issues are dealt with, please remove {{Proofread}} from the code.To discuss this page in more detail, feel free to use the talk page. When this work has been completed, you may remove this instance of {{Proofread}} from the code. |
Let $R$ be a closed rectangle on $\R^n$
Let $f : R \to \R$ be a bounded real-valued function on $R$.
Suppose that:
- $\ds \underline{\int_R} \map f x \rd x = \overline{\int_R} \map f x \rd x$
where $\ds \underline{\int_R}$ and $\ds \overline{\int_R}$ denote the lower Darboux integral and upper Darboux integral, respectively.
Then the multiple Darboux integral of $f$ over $R$ is defined and denoted as:
- $\ds \int_R \map f x \rd x = \underline{\int_R} \map f x \rd x = \overline{\int_R} \map f x \rd x$
and $f$ is (properly) multiple integrable over $R$ in the sense of Darboux.