Talk:Tangential angle

Failed to parse
I'm getting a lot of Failed to parse (Cannot write to or create math output directory) errors. I don't know if it's my fault, but it doesn't look pretty... —Preceding unsigned comment added by 84.193.37.213 (talk) 07:57, 4 December 2008 (UTC)

Polar tangential angle terminology
There is some question as to whether the phrase "polar tangential angle" is standard terminology. It is a translation from the French of the phrase "angle tangentiel polaire" used in Robert Ferréol's Encyclopédie des Formes Mathématiques Remarquables, given specifically in the notations page and used in several other places on that site (e.g. "Spirale Sinusoïdale"). Unfortunately, Ferréol does not give specific references so it's hard to tell what his source was, if any. Google Books did turn up many derivations for the formula for the angle in English, such as the Williamson book given in the references section, but none that I could find give an acceptable name to the angle. The term "polar tangential angle" does appear in the Planet Math site however (see the references section). So, even though phrase is not referenced as well as I would like, there is some foundation for it. Also, the concept itself is well documented and it's useful to have a name for it. I believe therefore that its use in the article is justified.--RDBury (talk) 15:56, 15 October 2009 (UTC)