Generalized von Neumann-Jordan and James Constants for Quasi-Banach Spaces.

The generalized von Neumann-Jordan constant C(p)NJ (B) and the James constant J(B) for a quasi-Banach space were introduced in [7]. In this note, it is shown that C(p)NJ (B) ≥ 2 for any quasi-Banach space B andC(p)NJ (B) < 2 if and only if B is uniformly non-square. Along with relationship between J(B) and C(p)NJ (B), the criterion for the uniformily smooth quasi-Banach space is also established. [ABSTRACT FROM AUTHOR]