  A gradient discretisation method (GDM), Gradient schemes, Convergence
analysis, Existence of weak solutions, Anisotropic reaction diffusion models,
Dirichlet and Neumann boundary conditions, Non conforming finite element
methods, Finite volume schemes, Hybrid mixed mimetic (HMM) method,
Crouzeix--Raviart scheme, Brain tumour dynamics, Fractional anisotropy.
