Question: how do I solve this problem? Let r() be a nice vector valued function of I variable over the real line (so that We can

how do I solve this problem?

Let r() be a nice vector valued function of I variable over the real line (so that We can take the derivative of each component as many times as we want ). Show that if r (t) . rit) = 0 for every t, then Ircell = Ircol for every t That is , Is ( +)I must be a constant function

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