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This volume contains the proceedings of the East Asia Joint
Symposium on Fields and Strings 2021, held at the Media Center of
Osaka City University on November 22-27, 2021. About 160 physicists
from all over East Asia attended physically or joined online this
symposium and more than 50 researchers presented their results in
the invited lectures, the short talks or the poster session.
Quantum field theory and string theory in the context of several
exciting developments were discussed, which include frontiers of
supersymmetric gauge theory, anomalies and higher form symmetries,
and several issues on quantum gravity and black holes.
Focusing on the theory of shadowing of approximate trajectories
(pseudotrajectories) of dynamical systems, this book surveys recent
progress in establishing relations between shadowing and such basic
notions from the classical theory of structural stability as
hyperbolicity and transversality. Special attention is given to the
study of "quantitative" shadowing properties, such as Lipschitz
shadowing (it is shown that this property is equivalent to
structural stability both for diffeomorphisms and smooth flows),
and to the passage to robust shadowing (which is also equivalent to
structural stability in the case of diffeomorphisms, while the
situation becomes more complicated in the case of flows). Relations
between the shadowing property of diffeomorphisms on their chain
transitive sets and the hyperbolicity of such sets are also
described. The book will allow young researchers in the field of
dynamical systems to gain a better understanding of new ideas in
the global qualitative theory. It will also be of interest to
specialists in dynamical systems and their applications.
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