Alternative Fourier-series approach to nonlinear oscillations

Alternative linear structures associated with regular Lagrangians. Weyl quantization and the Von Neumann uniqueness theorem

Alternative perturbation approaches in classical mechanics

Alternative structures and bi-Hamiltonian systems on a Hilbert space

Ambient Diffeomorphism Symmetries of Embedded Submanifolds, Multisymplectic BRST and Pseudoholomorphic Embeddings

Amenability of the Gauge Group

Amoebas of complex hypersurfaces in statistical thermodynamics

Among Quadratic Hamiltonians, Bogoliubov Transformations and Non-Regular States on CCRs *-Algebra. I. Pure and Invariant States. (In the Mood for the Manuceau Verbeure Theorems about Quasi-free States and Automorphisma of the CCR Algebra)

An $su(1,1)$ algebraic approach for the relativistic Kepler-Coulomb problem

An accurate analytic solution to the Thomas-Fermi equation

An Action Principle for an Interacting Fermion System and its Analysis in the Continuum Limit

An Action Principle for the Masses of Dirac Particles

An Adhesion Model for the Drag Force

An Adiabatic Theorem for Resonances

An Adiabatic Theorem without a Gap Condition

An algebraic approach to laying a ghost to rest

An algebraic approach to problems with polynomial Hamiltonians on Euclidean spaces

An Algebraic Characterization of singular quasi-bi-Hamiltonian systems

An Algebraic Characterization of singular quasi-bi-hamiltonian systems

An Algebraic Characterization of Vacuum States in Minkowski Space. III. Reflection Maps