English

The skew generalized Von Neumann Jordan constant in the unit sphere

Functional Analysis 2024-11-18 v1

Abstract

In this paper, we introduce a new constant for Banach spaces, denoted as C~NJp(ξ,v,X)\widetilde{C}_{\mathrm{NJ}}^p(\xi, v, X). We provide calculations for both the lower and upper bounds of this constant, as well as its exact values in certain Banach spaces. Furthermore, we give the inequality relationship between the C~NJp(ξ,v,X)\widetilde{C}_{\mathrm{NJ}}^p(\xi, v, X) constant and the other two constants. Besides, we establish an equivalent relationship between the C~NJp(ξ,v,X)\widetilde{C}_{\mathrm{NJ}}^p(\xi, v, X) constant and the C~NJ(p)(X)\widetilde{C}_{\mathrm{NJ}}^{(p)}(X) constant. Specifically, we shall exhibit the connections between the constant C~NJp(ξ,v,X)\widetilde{C}_{\mathrm{NJ}}^p(\xi, v, X) and certain geometric characteristics of Ba nach spaces, including uniform convexity and uniform nonsquareness. Additionally, a sufficient condition for uniform normal structure about the C~NJp(ξ,v,X)\widetilde{C}_{\mathrm{NJ}}^p(\xi, v, X) constant is also established.

Keywords

Cite

@article{arxiv.2411.10094,
  title  = {The skew generalized Von Neumann Jordan constant in the unit sphere},
  author = {Yuxin Wang and Qi Liu and Jinyu Xia and Shuaizhe Huang},
  journal= {arXiv preprint arXiv:2411.10094},
  year   = {2024}
}

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19 pages