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Exercise 2.4.3

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Borrow from problem 1, take $p_{i} = \frac{1}{n}$ , we have $V_{1} = n (a_{1}^{2} + \dots + a_{n}^{2})$ , this must be greater than or equal to the minimum value ${(a_{1} + \dots + a_{n})}^{2}$ , so $n (a_{1}^{2} + \dots + a_{n}^{2}) \geq {(a_{1} + \dots + a_{n})}^{2}$

niuers

2020-03-20 00:00

Exercise 2.4.3

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