Skip to main content

Moving Frames and Noether’s Finite Difference Conservation Laws II

Mansfield, Elizabeth L., Rojo-Echeburua, Ana (2019) Moving Frames and Noether’s Finite Difference Conservation Laws II. Transactions of Mathematics and its applications, . E-ISSN 2398-4945. (doi:10.1093/imatrm/tnz005) (KAR id:74250)


In this second part of the paper, we consider finite difference Lagrangians which are invariant under linear and projective actions of SL(2), and the linear equi-affine action which preserves area in the plane.

We first find the generating invariants, and then use the results of the first part of the paper to write the Euler–Lagrange difference equations and Noether’s difference conservation laws for any invariant Lagrangian, in terms of the invariants and a difference moving frame. We then give the details of the final integration step, assuming the Euler Lagrange equations have been solved for the invariants. This last step relies on understanding the Adjoint action of the Lie group on its Lie algebra. We also use methods to integrate Lie group invariant difference equations developed in Part I.

Effectively, for all three actions, we show that solutions to the Euler–Lagrange equations, in terms of the original dependent variables, share a common structure for the whole set of Lagrangians invariant under each given group action, once the invariants are known as functions on the lattice.

Item Type: Article
DOI/Identification number: 10.1093/imatrm/tnz005
Uncontrolled keywords: Noether’s Theorem, Finite Difference, Discrete Moving Frames
Subjects: Q Science > QA Mathematics (inc Computing science) > QA299 Analysis, Calculus
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Mathematics, Statistics and Actuarial Science
Depositing User: Elizabeth Mansfield
Date Deposited: 04 Jun 2019 13:55 UTC
Last Modified: 09 Jan 2024 10:06 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Mansfield, Elizabeth L..

Creator's ORCID:
CReDIT Contributor Roles:

Rojo-Echeburua, Ana.

Creator's ORCID:
CReDIT Contributor Roles:
  • Depositors only (login required):

Total unique views for this document in KAR since July 2020. For more details click on the image.