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Functional Identities (Paperback, 2007 ed.)
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Functional Identities (Paperback, 2007 ed.)
Series: Frontiers in Mathematics
Expected to ship within 10 - 15 working days
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A functional identity (FI) can be informally described as an
identical relation involving(arbitrary)elementsinaringtogetherwith(
unknown )functions;more precisely,
elementsaremultipliedbyvaluesoffunctions.ThegoalofthegeneralFI
theory is to determine the form of these functions, or, when this
is not possible, to determine the structure of the ring admitting
the FI in question. This theory has turnedouttobeapowerfultoolfor
solvingavarietyofproblemsindi?erentareas. It is not always easy to
recognize that the problem in question can be interpreted through
some FI; often this is the most intriguing part of the process. But
once one succeeds in discovering an FI that ?ts into the general
theory, this abstract theory then as a rule yields the desired
conclusions at a high level of generality. Among classical
algebraic concepts, the one of a polynomial identity (PI) seems to
be, at least on the surface, the closest one to the concept of an
FI. In fact, a PI is formally just a very special example of an FI
(where functions are polynomials).However, the theoryof PI
shasquite di?erent goalsthan the theory of FI s. One could say,
especially from the point of view of applications, that the
twotheoriesarecomplementaryto eachother.Under
somenaturalrestrictions, PI
theorydealswithringsthatareclosetoalgebrasoflowdimensions,
whileFItheory gives de?nitive answers in algebras of su?ciently
large or in?nite dimensions."
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