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Serial Rings (Paperback, Softcover reprint of the original 1st ed. 2001)
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Serial Rings (Paperback, Softcover reprint of the original 1st ed. 2001)
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The main theme in classical ring theory is the structure theory of
rings of a particular kind. For example, no one text book in ring
theory could miss the Wedderburn-Artin theorem, which says that a
ring R is semisimple Artinian iffR is isomorphic to a finite direct
sum of full matrix rings over skew fields. This is an example of a
finiteness condition which, at least historically, has dominated in
ring theory. Ifwe would like to consider a requirement of a
lattice-theoretical type, other than being Artinian or Noetherian,
the most natural is uni-seriality. Here a module M is called
uni-serial if its lattice of submodules is a chain, and a ring R is
uni-serial if both RR and RR are uni-serial modules. The class of
uni-serial rings includes commutative valuation rings and closed
under homomorphic images. But it is not closed under direct sums
nor with respect to Morita equivalence: a matrix ring over a
uni-serial ring is not uni-serial. There is a class of rings which
is very close to uni-serial but closed under the constructions just
mentioned: serial rings. A ring R is called serial if RR and RR is
a direct sum (necessarily finite) of uni-serial modules. Amongst
others this class includes triangular matrix rings over a skew
field. Also if F is a finite field of characteristic p and G is a
finite group with a cyclic normal p-Sylow subgroup, then the group
ring FG is serial.
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