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Finite-dimensional right duo algebras are duo
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Available examples of right (but not left) duo rings include rings without unity element which are two dimensional algebras over finite prime fields. We prove that a right duo ring with unity element which is a finite dimensional algebra over an arbitrary field
K
K
is a duo ring. This result is obtained as a corollary of a theorem on right duo, right artinian rings
R
R
with unity: left duo-ness is equivalent to each right ideal of
R
R
having equal right and left composition lengths, which is equivalent to the same property on
R
R
alone. Another result concerns algebras over a field which are semiprimary right duo rings: such an algebra is left duo provided (1) the algebra is finite dimensional modulo its radical and (2) the square of the radical is zero. These two provisions are shown to be essential by examples which are local algebras, duo on one side only.
American Mathematical Society (AMS)
Title: Finite-dimensional right duo algebras are duo
Description:
Available examples of right (but not left) duo rings include rings without unity element which are two dimensional algebras over finite prime fields.
We prove that a right duo ring with unity element which is a finite dimensional algebra over an arbitrary field
K
K
is a duo ring.
This result is obtained as a corollary of a theorem on right duo, right artinian rings
R
R
with unity: left duo-ness is equivalent to each right ideal of
R
R
having equal right and left composition lengths, which is equivalent to the same property on
R
R
alone.
Another result concerns algebras over a field which are semiprimary right duo rings: such an algebra is left duo provided (1) the algebra is finite dimensional modulo its radical and (2) the square of the radical is zero.
These two provisions are shown to be essential by examples which are local algebras, duo on one side only.
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