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I would like guidance on how to solve this Linear or not? Determine whether each of the following scalar-valued functions of n-vectors is linear. If
I would like guidance on how to solve this
Linear or not? Determine whether each of the following scalar-valued functions of n-vectors is linear. If it is a linear function, give its inner product representation, i.e., an n-vector a for which f(x) = a T x for all x. If it is not linear, give specific x, y, ?, and ? for which superposition fails, i.e., f(?x + ?y) 6= ?f(x) + ?f(y). (a) The spread of values of the vector, defined as f(x) = maxk xk ? mink xk. (b) The difference of the last element and the first, f(x) = xn ? x1.
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