3 papers
math.FA2026
Nonembedding of Lorentz sequence spaces into Lorentz function spaces
Junxiang Qi, Qi Liu
Let with , and suppose that or . We prove that the Lorentz sequence space does not isomorphically embed into $L_ {p, q}(0,1…
math.FA2026
Birkhoff-Orthogonal Takahashi-von Neumann-Jordan Type Constants in Banach Spaces
Junxiang Qi, Zhouping Yin, Qi Liu
In this paper, we introduce a new family of geometric constants CtB(X) of Birkhoff-orthogonal Takahashi-von Neumann-Jordan type for real Banach spaces. We discuss their basic prope…
math.FA2026
Generalized geometric constants related to Birkhoff orthogonality in Banach spaces
Junxiang Qi, Qian Li, Zhouping Yin +4
In this paper, based on Birkhoff orthogonality, we introduce two geometric constants and $\boldsymbol{D}_{\boldsy…