In this exercise we will determine the condition that a vector field can be considered to be

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In this exercise we will determine the condition that a vector field can be considered to be globally parallel on a manifold. More precisely, what guarantees that we can find a vector field satisfying the equation
(VV) = V

(a) A necessary condition, called the integrability condition for this equation, follows from the commuting of partial derivatives. Show that Vα,νβ = Vα,βν implies

In this exercise we will determine the condition that a

(b) By relabeling indices, work this into the form

In this exercise we will determine the condition that a

This turns out to be sufficient, as well.

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