In June 2026, a group of mathematicians, computer scientists, philosophers, and historians published the Leiden Declaration on Artificial Intelligence and Mathematics (the Declaration). It reads as a manifesto for one discipline, yet its concerns – about who can be an author, how results are verified, and what becomes of work fed into AI systems – are precisely the questions now being litigated, legislated, and contracted around in Europe.
For lawyers and businesses, the Declaration is a useful early-warning signal: it shows where professional norms are hardening, often ahead of the law.
In Depth
What the Declaration actually says
Born out of a 2025 conference at the Lorentz Center in Leiden, the Declaration is not a regulation. It is a voluntary code that individuals can sign, and that professional bodies are invited to endorse and adapt. Its force is reputational and normative rather than legal, but that is exactly how many enforceable standards begin.
