# title
The DEAL.II finite element library: Design, features, and insights

# abstract
deal.II is a state-of-the-art finite element library focused on generality, dimension-independent programming, parallelism, and extensibility. Herein, we outline its primary design considerations and its sophisticated features such as distributed meshes, $hp$-adaptivity, support for complex geometries, and matrix-free algorithms. But deal.II is more than just a software library: It is also a diverse and worldwide community of developers and users, as well as an educational platform. We therefore also discuss some of the technical and social challenges and lessons learned in running a large community software project over the course of two decades.

# publicationVenue.label
Computers and Mathematics with Applications

# publicationOutlet
COMPUTERS & MATHEMATICS WITH APPLICATIONS

# authorList[]
Arndt, D., Bangerth, W., Davydov, D., Heister, T., Heltai, L., Kronbichler, M., ... Wells, D.