The notion of 2k-inner product is introduced as a generalization of usual inner product and Q-inner product ([4]-[8]). As a consequence, is denned the notion of 2k-normed space and some properties, e.g. uniformly convexity, Gateaux differentiability and Riesz property of the dual, are given.
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In this paper we extend some results on the refinement of Cauchy-Buniakowski-Schwarz's inequality and Aćzel's inequality in inner product spaces to 2-inner product spaces.
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