Double integral

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With history: This is a redirect from a page containing substantive page history. This page is kept as a redirect to preserve its former content and attributions. Please do not remove the tag that generates this text (unless the need to recreate content on this page has been demonstrated), nor delete this page.
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- When used on a template redirect, it will automatically populate Category:Template redirects with possibilities.

When appropriate, protection levels are automatically sensed, described and categorized.