Compositio Mathematica is a prestigious, well-established journal publishing first-class research papers that traditionally focus on the mainstream of pure mathematics. Compositio Mathematica has a broad scope which includes the fields of algebra, number theory, topology, algebraic and differential geometry and global analysis. Papers on other topics are welcome if they are of broad interest. All contributions are required to meet high standards of quality and originality. The Journal has an international editorial board reflected in the journal content. Online access is free for all papers published 5 years ago or more. Papers published before 1997 are available from the NUMDAM website. Compositio is owned and published by non-profit organisations (the Foundation Compositio Mathematica and the London Mathematical Society) that use any surplus income from the journal to sponsor mathematics and mathematical research.