Abstract:
We consider numerical invariants of identities of nonassociative algebras. We prove that codimension sequence of any finitely generated metabelian algebra has exponentially bounded codimension growth. It is shown that the upper PI-exponent increases at most to 1 after adjoining an external unit. For two-step left-nilpotent algebras it is proved that the lower PI-exponent increases at least to 1.
This publication is cited in the following 4 articles:
M. V. Zaicev, S. P. Mishchenko, “Codimension Sequences and their Asymptotic Behavior”, J Math Sci, 257:6 (2021), 825
Dušan D. Repovš, Mikhail V. Zaicev, “On existence of PI-exponents of unital algebras”, era, 28:2 (2020), 853
M. V. Zaicev, D. D. Repovš, “Combinatorics on binary words and codimensions of identities in left nilpotent algebras”, Algebra and Logic, 58:1 (2019), 23–35
M. V. Zaitsev, S. P. Mischenko, “Posledovatelnosti korazmernostei tozhdestv i ikh asimptoticheskoe povedenie”, Fundament. i prikl. matem., 22:4 (2019), 115–127