The basic theory of the strengthened Cauchy-Buniakowskii-Schwarz inequality and its applications in multilevel methods for the solution of linear systems arising from finite element or finite ...
https://doi.org/10.4169/amer.math.monthly.122.8.781 https://www.jstor.org/stable/10.4169/amer.math.monthly.122.8.781 The Cauchy–Schwarz inequality for positive ...
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