1. Preconditioning high order \(H^2\) conforming finite elements on triangles

   • Mark Ainsworth
   • Charles Parker

   OriginalPaper 11 June 2021 Pages: 223 - 254

   

2. New preconditioners for the Laplace and Helmholtz integral equations on open curves: analytical framework and numerical results

   • François Alouges
   • Martin Averseng

   OriginalPaper Open access 21 June 2021 Pages: 255 - 292

   

3. Sparse harmonic transforms II: best s-term approximation guarantees for bounded orthonormal product bases in sublinear-time

   • Bosu Choi
   • Mark Iwen
   • Toni Volkmer

   OriginalPaper 06 June 2021 Pages: 293 - 362

   

4. A posteriori error bounds for fully-discrete hp-discontinuous Galerkin timestepping methods for parabolic problems

   • Emmanuil H. Georgoulis
   • Omar Lakkis
   • Thomas P. Wihler

   OriginalPaper Open access 14 April 2021 Pages: 363 - 386

5. Galerkin approximation of holomorphic eigenvalue problems: weak T-coercivity and T-compatibility

   • Martin Halla

   OriginalPaper Open access 15 June 2021 Pages: 387 - 407

6. Dynamical reduced basis methods for Hamiltonian systems

   • Cecilia Pagliantini

   OriginalPaper Open access 18 June 2021 Pages: 409 - 448

   

7. On the method of reflections

   • Philippe Laurent
   • Guillaume Legendre
   • Julien Salomon

   OriginalPaper 21 June 2021 Pages: 449 - 493

   

8. Correction to: Finite element error estimates in non-energy norms for the two-dimensional scalar Signorini problem

   • Constantin Christof
   • Christof Haubner

   Correction 21 June 2021 Pages: 495 - 495