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On the Cauchy–Schwarz inequality and its reverse in 2-*-semi inner product spaces
In this paper, we investigate the $${\mathcal {A}}$$-valued Cauchy–Schwarz inequality and its reverse in a 2-semi inner product $$ {\mathcal {A}}$$-module over a locally $$C^*$$-algebra $$ {\mathcal {A}}$$.