Date: Apr 25, 2013 11:02 AM
Author: Tom Roberts
Subject: Re: What is a vector field?

On 4/24/13 4/24/13   10:33 AM, Wade Jenkins wrote:
> Tom Roberts wrote:
>>>> Hmmmm. In physics, where we always have an ORIENTABLE manifold WITH
>>>> METRIC,

>>> Certainly at an undergraduate level, but once you get into things like
>>> gauge theories you need manifolds without a metric.

>> Yes. I meant spacetime manifold.

> Finally you admit, relativity is an undergraduate level!

SR, certainly.

But GR and gauge theories not, and the issues discussed here are not (except
possibly for a very advanced undergraduate).

Tom Roberts