Numerical methods 8 Finite element method 5 Nonlinear equations 5 Error estimates 4 Constrained optimization 3 Discretizations 3 Errors 3 Galerkin methods 3 Mesh generation 3 Partial differential equations 3 Bose-Einstein condensation 2 Bose-Einstein-condensation 2 Bose–Einstein condensation 2 Condensation 2 Data assimilation 2 Decomposition approach 2 Discontinous Galerkin methods 2 Domain decomposition methods 2 Energy landscape 2 Equality constraints 2 Equations of motion 2 Fixed points 2 Higher index 2 Inverse problems 2 Iterative methods 2 Manifold optimization 2 Neural-networks 2 Nonlinear least square problem 2 Nonlinear least squares problems 2 Optimisations 2