# Question: a If f is a differentiable vector field

a. If f is a differentiable vector field on M C Rn, show that there is an open set AЭM and a differentiable vector field F on A with F(x) = F (x) for xЄM.

b. If M is closed, show that we can choose A = Rn.

b. If M is closed, show that we can choose A = Rn.

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