Applications harmoniques Basic linear algebra Calculus of variations and optimal control; optimization Differential geometry Differential topology Geometry, Differential Géométrie différentielle Global analysis, analysis on manifolds Harmonic maps Linear and multilinear algebra; matrix theory Manifolds and cell complexes Miscellaneous inequalities involving matrices Partial differential equations Proceedings, conferences, collections, etc Quantum field theory on curved space backgrounds Quantum field theory; related classical field theories Quantum theory Spaces and manifolds of mappings (including nonlinear versions of 46Exx) Spaces of imbeddings and immersions Symplectic and contact topology Symplectic and contact topology. $2 Manifolds and cell complexes Variational principles of physics Variational principles of physics (should also be assigned at least one other classification number in section 49) Variational problems in infinite-dimensional spaces