
Re: Distance Between Lines in R^3 (fwd)
Posted:
Jul 28, 2013 9:26 PM


In article <kt4635$fis$1@news.albasani.net>, Thomas Nordhaus <thnord2002@yahoo.de> wrote:
> Am 28.07.2013 23:01, schrieb Ken Pledger: > > .... > > That's all. It's a traditional method in old textbooks which aren't > > read much any more, and it doesn't need any calculus. > > I think implicitly it does....
It needs the fact that the shortest path from a point to a line is along the perpendicular. My geometry students prove that as a little exercise using Euclid I.16 and 19  definitely no calculus.
Ken Pledger.

