1. Foreword

   OriginalPaper Pages: 119 - 120

2. Symmetry Algebra of the Benjamin–Ono Equation

   • V. N. Chetverikov

   OriginalPaper Pages: 121 - 138

3. The ‘Three-Line’ Theorem for the Vinogradov C-Spectral Sequence of the Yang–Mills Equations

   • Dmitri Gessler

   OriginalPaper Pages: 139 - 153

4. Contact Transformations and Local Reducibility of ODE to the Form y‴=0

   • V. N. Gusyatnikova
   • V. A. Yumaguzhin

   OriginalPaper Pages: 155 - 179

5. Double Complexes and Cohomological Hierarchy in a Space of Weakly Invariant Lagrangians of Mechanics

   • O. M. Khudaverdian
   • D. A. Sahakyan

   OriginalPaper Pages: 181 - 215

6. Coverings and Integrability of the Gauss–Mainardi–Codazzi Equations

   • Joseph Krasil'shchik
   • Michal Marvan

   OriginalPaper Pages: 217 - 230

7. Quantum Mechanics on Manifolds

   • V. Lychagin

   OriginalPaper Pages: 231 - 251

8. Symmetries of Linear and Linearizable Systems of Differential Equations

   • A. V. Samokhin

   OriginalPaper Pages: 253 - 300

9. Graded Differential Equations and Dirac Type Operators

   • Lev V. Zilbergleit

   OriginalPaper Pages: 301 - 320

10. Contents to Volume 56

    OriginalPaper Pages: 321 - 322