## Question

###### He keeps talking about a line integral around a closed-loop, ANDthe integral over an open surface.What is the definition of a line integral around aclosed-loop?What is the definition of an open surface (compared to a closedsurface)?

He keeps talking about a line integral around a closed-loop, AND the integral over an open surface. What is the definition of a line integral around a closed-loop? What is the definition of an open surface (compared to a closed surface)?

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