TY - JOUR
ID - 289
TI - Nonexpansive mappings on complex C*-algebras and their fixed points
JO - International Journal of Nonlinear Analysis and Applications
JA - IJNAA
LA - en
SN -
AU - Alimohammadi, Davood
AD - Department of Mathematics, Faculty of Science, Arak university, Arak 38156-8-8349, Iran
Y1 - 2015
PY - 2015
VL - 7
IS - 1
SP - 21
EP - 29
KW - Banach space
KW - C*-algebra
KW - Fixed point property
KW - Nonexpansive mapping
KW - normed linear space
DO - 10.22075/ijnaa.2015.289
N2 - A normed space $mathfrak{X}$ is said to have the fixed point property, if for each nonexpansive mapping $T : E longrightarrow E $ on a nonempty bounded closed convex subset $ E $ of $ mathfrak{X} $ has a fixed point. In this paper, we first show that if $ X $ is a locally compact Hausdorff space then the following are equivalent: (i) $X$ is infinite set, (ii) $C_0(X)$ is infinite dimensional, (iii) $C_0 (X)$ does not have the fixed point property. We also show that if $A$ is a commutative complex $ mathsf{C}^star$--algebra with nonempty carrier space, then the following statements are equivalent: (i) Carrier space of $ A $ is infinite, (ii) $ A $ is infinite dimensional, (iii) $ A $ does not have the fixed point property. Moreover, we show that if $ A $ is an infinite complex $ mathsf{C}^star$--algebra (not necessarily commutative), then $ A $ does not have the fixed point property.
UR - https://ijnaa.semnan.ac.ir/article_289.html
L1 - https://ijnaa.semnan.ac.ir/article_289_75ca5b7bd96a777bf6f51352b152a680.pdf
ER -