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Value Distribution Theory (Paperback, Softcover reprint of the original 1st ed. 1993)
Loot Price: R1,477
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Value Distribution Theory (Paperback, Softcover reprint of the original 1st ed. 1993)
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It is well known that solving certain theoretical or practical
problems often depends on exploring the behavior of the roots of an
equation such as (1) J(z) = a, where J(z) is an entire or
meromorphic function and a is a complex value. It is especially
important to investigate the number n(r, J = a) of the roots of (1)
and their distribution in a disk Izl ~ r, each root being counted
with its multiplicity. It was the research on such topics that
raised the curtain on the theory of value distribution of entire or
meromorphic functions. In the last century, the famous
mathematician E. Picard obtained the pathbreaking result: Any
non-constant entire function J(z) must take every finite complex
value infinitely many times, with at most one excep tion. Later, E.
Borel, by introducing the concept of the order of an entire
function, gave the above result a more precise formulation as
follows. An entire function J (z) of order A( 0 < A < (0)
satisfies -1' logn(r, J = a) \ 1m = 1\ r->oo logr for every
finite complex value a, with at most one exception. This result,
generally known as the Picard-Borel theorem, lay the foundation for
the theory of value distribution and since then has been the source
of many research papers on this subject.
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