Algorithms 4 Inverse problems 4 Iterative methods 4 Mathematical models 4 Parameter estimation 4 Adjoint method 3 Finite element method 3 Acoustic equation 2 Acoustic waves 2 Acoustics 2 Adjoint methods 2 Approximation theory 2 Boundary value problems 2 Convergence of numerical methods 2 Differential equations 2 Direct algorithms 2 Finite element methods 2 Interfaces (materials) 2 Seismic inversion 2 Seismic inversions 2 Seismic waves 2 Sensitivity analysis 2 Wave equations 2 PDE-constrained optimization 1 Reaction–diffusion equation 1 Tumor invasión 1