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RE: Dot Product in Cylindrical Coordinates

• To: mathgroup at smc.vnet.net
• Subject: [mg69236] RE: [mg69211] Dot Product in Cylindrical Coordinates
• From: "David Park" <djmp at earthlink.net>
• Date: Sun, 3 Sep 2006 01:39:38 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Sergio,

I get 2 also, using an independent calculation using differential forms and
Hodge star.

I think the Mathematica vector calculus package get confused between the
points and the tangent vectors.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

From: Sergio Miguel Terrazas Porras [mailto:sterraza at uacj.mx]
To: mathgroup at smc.vnet.net


Hello group:

When I calculate the dot product of vectors {1,Pi/4,0} and {2,0,1} in
Cylindrical Coordinates Mathematica 5.1 returns the result Sqrt[2], when the
result should be 2.
What is going on ?
Thanks
Sergio Terrazas