Wikipedia:Reference desk/Archives/Mathematics/2016 July 26

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July 26

A question about indefinite integral

How to find ∫x^xdx? Litqforviki (talk) 03:10, 26 July 2016 (UTC)

This looks to be a series approximation. Here is a source that may help you. ~Oshwah~^{(talk) (contribs)} 03:16, 26 July 2016 (UTC)

With particular limits of integration, it's an integral known as the Sophomore's dream. Confusing Manifestation(Say hi!) 05:12, 26 July 2016 (UTC)

What is the aspect ratio of earth?

What is the aspect ratio of earth?201.79.64.105 (talk) 20:21, 26 July 2016 (UTC)

Not really a math question but I suppose it would be the ratio of earth's equatorial diameter to polar diameter, or 12756 km/ 12714 km = 1.0033. See Earth physical characteristics tables. --RDBury (talk) 20:59, 26 July 2016 (UTC)

We do have Aspect_ratio#Ellipses which makes for a decent analogy. SemanticMantis (talk) 15:12, 27 July 2016 (UTC)

You might also be interested in oblateness or roundness. See also geoid and geodesy for the general study and representation of the the Earth's precise shape. 15:12, 27 July 2016 (UTC)