# Talk:Fundamental vector field

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Field:  Geometry

Is it sure, that ${\displaystyle d}$ is an exterior derivative in the definition? Not a Pushforward (differential)?

89.135.19.250 (talk) 17:47, 30 November 2013 (UTC)

Why do you use "pushfoward"? If G is acting on X, then let ${\displaystyle f(g)=g\cdot x}$ so ${\displaystyle f:G\to X}$ and differentiating this (i.e., exterior derivative) we get: ${\displaystyle df_{1}:T_{1}G={\mathfrak {g}}\to T_{x}X}$. Varying x you get a fundamental vector field. (I'm not sure why the article is using strange notations.) -- Taku (talk) 19:14, 30 November 2013 (UTC)
I don't understand this. Why do you say "differentiating this (i.e., exterior derivative)"? Is any relationship between differential (i.e the tangent map) and the exterior derivative (i.e. an operation that assigns a (k+1) -form to a k-form)? 89.135.19.250 (talk) 20:04, 30 November 2013 (UTC)
Ah, I see you're thinking of differential forms. No, "d" here is not that exterior derivative. I have changed the wording accordingly. -- Taku (talk) 00:33, 1 December 2013 (UTC)