Cauchy Schwarz Inequality Sign Video
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Definition
If a_1, ... , a_n and b_1, ... , b_n are arbitrary real numbers, we have [sum (a_k)(b_k)]^2 <= [sum (a_k)^2][sum (b_k)^2] with k=1 to n in each sum. Moreover, if some a_i do not equal 0 equality holds if and only if there is a real x such that (a_k)x + b_k = 0 for each k = 1, 2, ... , n.
Source: Mathematical Analysis, second edition by Tom M. Apostol
Example
Due to the complex notation of this theorem, please see the following link for reference: http://mathworld.wolfram.com/CauchysInequality.html
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