We propose an algorithm for the evaluation of elements of the kernel of an arbitrary derivation of a polynomial ring. The algorithm is based on an analog of the well-known Casimir element of a finite-dimensional Lie algebra. By using this algorithm, we compute the kernels of Weitzenböck derivation d(x i ) = x i−1, d(x 0) = 0, i = 0,…, n, for the cases where n ≤ 6.
Similar content being viewed by others
References
A. Nowicki, Polynomial Derivation and Their Ring of Constants, Copernicus University, Torun (1994).
A. Van Den Essen, Polynomial Automorphisms and the Jacobian Conjecture, Birkhäuser, Basel (2000).
G. Freudenburg, Algebraic Theory of Locally Nilpotent Derivations, Springer, Berlin (2006).
D. Hilbert, Theory of Algebraic Invariants, Cambridge University, Cambridge (1993).
R. Weitzenböck, “Über die Invarianten von linearen Gruppen,” Acta Math., 58, 231–293 (1932).
G.-M. Greuel and G. Pfister, “Geometric quotients of unipotent group actions,” Proc. London Math. Soc., 67, No. 1, 75–105 (1993).
A. Cerezo, Tables des Invariants Algébriqueset Rationnels d’une Matrice Nilpotente de Petite Dimension, Prépublications Mathématiques, Université de Nice, 146 (1987).
L. Bedratyuk, “A complete minimal system of covariants for the binary form of degree 7,” J. Symbol Comput., 44, No. 2, 211–220 (2009).
L. P. Bedratyuk and S. L. Bedratyuk, “A complete system of covariants of the binary form of degree 8,” Mat. Visn. NTSh, 5, 11–22 (2008).
L. P. Bedratyuk, “Casimir elements of derivations of a polynomial ring,” Mat. Stud., 27, 115–119 (2007).
V. V. Bavula and T. H. Lenagan, “Quadratic and cubic invariants of unipotent affine automorphisms,” J. Algebra, 320, No. 12, 4132–4155 (2008).
Author information
Authors and Affiliations
Additional information
Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 62, No. 4, pp. 435–452, April, 2010.
Rights and permissions
About this article
Cite this article
Bedratyuk, L.P. Kernels of derivations of polynomial rings and Casimir elements. Ukr Math J 62, 495–517 (2010). https://doi.org/10.1007/s11253-010-0367-x
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11253-010-0367-x