Mathematics – Rings and Algebras
Scientific paper
2009-05-07
Mathematics
Rings and Algebras
Scientific paper
In 1988, S. V. Okhitin proved that for any field k of characteristic zero, the T-space CP(M_2(k)) is finitely based, and he raised the question as to whether CP(A) is finitely based for every (unitary) associative algebra A with nonzero T-ideal of identities that is properly contained CP(A). V. V. Shchigolev (2001) showed that for any field k of characteristic zero, every T-space of the infinite dimensional free associative k algebra is finitely based, and it follows from this that every T-space of the infinite dimensional free unitary k algebra is also finitely based. This more than answers Okhitin's question (in the affirmative) for fields of characteristic zero. For a field of characteristic 2, the infinite-dimensional Grassmann algebras, unitary and nonunitary, are commutative and thus the T-space of central polynomials of each is finitely based. We shall show in the following that if p is a prime greater than 2 and k is an arbitrary field of characteristic p, then the T-space of central polynomials of the infinite dimension free (unitary or otherwise) associative algebra is finitely based, thus providing a negative answer to Okhitin's question.
Bekh-Ochir Chuluun
Rankin Stuart A.
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