Journal of the
Korean Mathematical Society
JKMS

ISSN(Print) 0304-9914 ISSN(Online) 2234-3008

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J. Korean Math. Soc. 2019; 56(5): 1333-1354

Online first article July 17, 2019      Printed September 1, 2019

https://doi.org/10.4134/JKMS.j180665

Copyright © The Korean Mathematical Society.

Banach function algebras of $n$-times continuously differentiable functions on $\mathbf{R}^d$ vanishing at infinity and their BSE-extensions

Jyunji Inoue, Sin-Ei Takahasi

Hokkaido University; Yamagata University

Abstract

In authors' paper in 2007, it was shown that the BSE-exten\-sion of $C^1_0(\mathbf{R})$, the algebra of continuously differentiable functions $f$ on the real number space $\mathbf{R}$ such that $f$ and $df/dx$ vanish at infinity, is the Lipschitz algebra $Lip_1(\mathbf{R})$. This paper extends this result to the case of $C^n_0(\mathbf{R}^d)$ and $C^{n-1,1}_b(\mathbf{R}^d)$, where $n$ and $d$ represent arbitrary natural numbers. Here $C^n_0(\mathbf{R}^d)$ is the space of all $n$-times continuously differentiable functions $f$ on $\mathbf{R}^d$ whose $k$-times derivatives are vanishing at infinity for $k=0,\ldots,n$, and $C^{n-1,1}_b(\mathbf{R}^d)$ is the space of all $(n-1)$-times continuously differentiable functions on $\mathbf{R}^d$ whose $k$-times derivatives are bounded for $k=0, \ldots ,n-1$, and $(n-1)$-times derivatives are Lipschitz. As a byproduct of our investigation we obtain an important result that $C^{n-1,1}_b(\mathbf{R}^d)$ has a predual.

Keywords: natural commutative Banach function algebra, Lipschitz algebra, BSE-extension, BSE-algebra, BED-algebra, bounded approximate identity, multiplier algebra

MSC numbers: Primary 46J15; Secondary 46J40, 46J20

Supported by: This work was supported by the Research Institute for Mathematical Sciences, a Joint Usage/Research Center located in Kyoto
University.

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