Primitive and almost primitive elements of Schreier varieties

V. A. Artamonov ; A. V. Klimakov ; A. A. Mikhalev ; A. V. Mikhalev

Fundamentalʹnaâ i prikladnaâ matematika, Tome 21 (2016) no. 2, pp. 3-35.

Résumé

A variety of linear algebras is said to be Schreier if any subalgebra of a free algebra of this variety is free. A system of elements of a free algebra is primitive if there is a complement of this system with respect to a free generating set of the free algebra. An element of a free algebra of a Schreier variety is said to be almost primitive if it is not primitive in the free algebra, but it is a primitive element of any subalgebra that contains it. This survey article is devoted to the study of primitive and almost primitive elements of Schreier varieties.

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