### Quick description

Sometimes one can calculate a definite integral exactly by antidifferentiating and using the fundamental theorem of calculus. However, sometimes this method does not work, or is not appropriate. (The second might be the case if, for example, one was integrating not an explicit function but an unspecified function about which one had certain information.) Also, in many applications one does not actually need to compute an integral exactly; merely obtaining a sufficiently good approximation to that integral, or even just an upper bound on its magnitude, may be sufficient in many applications (particularly those in analysis).

This article gives links to further articles about techniques for approximating or bounding integrals.

### Links to articles

Methods for approximating integrals

## Comments

## Inline comments

The following comments were made inline in the article. You can click on 'view commented text' to see precisely where they were made.

## A quick question about this:

Mon, 20/04/2009 - 20:12 — gowersA quick question about this: is it your intention to chop up the existing "bounding integrals" article into a fairly large number of subarticles, as this suggests? I myself think that would be a good idea – each technique could then be illustrated by more than one example, and each article could be devoted to a single technique (which, though not an absolute requirement, is in general preferable I think).

## Yes, I'm chopping it up

Mon, 20/04/2009 - 20:43 — taoThe article was getting rather unwieldy, and I was always relabeling the references between one method and another. It will lead to ten stubby articles rather than one overly long one, but this is probably better for the longer term development of these pages.

## Excellent – I look

Mon, 20/04/2009 - 20:51 — gowersExcellent – I look forward to the results, and to making heavy use of links to these articles when I come to write the I have a problem about integration page.

## From the point of view of

Thu, 23/04/2009 - 13:08 — gowersFrom the point of view of linking to this article, it is quite inconvenient to have levels of the hierarchy that are not articles, with sublevels that are. Would it be possible to create small articles for the headings above that are currently in black? (I could do this myself, but am rather busy for the next 24 hours or so.)