Semigroup theory might be
termed `Cold War mathematics' because of the time during which it
developed. There were thriving schools on both sides of the Iron
Curtain, although the two sides were not always able to communicate
with each other, or even gain access to the other's publications. A
major theme of this book is the comparison of the approaches to the
subject of mathematicians in East and West, and the study of the extent
to which contact between the two sides was possible.
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