Concept
Lagrange's four-square theorem
Related publications (4)
A mathematical theory for mass lumping and its generalization with applications to isogeometric analysis
Annalisa Buffa, Espen Sande, Yannis Dirk Voet
Explicit time integration schemes coupled with Galerkin discretizations of time-dependent partial differential equations require solving a linear system with the mass matrix at each time step. For applications in structural dynamics, the solution of the li ...
2022High order methods for the approximation of the incompressible Navier-Stokes equations in a moving domain
Alfio Quarteroni, Gonçalo Pena
In this paper we address the numerical approximation of the incompressible Navier-Stokes equations in a moving domain by the spectral element method and high order time integrators. We present the Arbitrary Lagrangian Eulerian (ALE) formulation of the inco ...
Elsevier2012On the essential dimension of cyclic p-groups
Let p be a prime number, let K be a field of characteristic not p, containing the p-th roots of unity, and let r >= 1 be an integer. We compute the essential dimension of Z/p(r) Z over K (Theorem 4.1). In particular, i) We have edℚ(ℤ/8ℤ)=4, a result which ...
Springer-Verlag2008Groupoid of orientational variants
Daughter crystals in orientation relationship with a parent crystal are called variants. They can be created by a structural phase transition (Landau or reconstructive), by twinning or by precipitation. Internal and external classes of transformations defi ...
2006