Mathematics is not a static field of knowledge, but rather a multifaceted, dynamic, and expanding discipline, in which areas seemingly far from applications suddenly become indispensable and applications stimulate challenging foundational mathematical research. Moreover, many application-driven mathematical developments are also motivated and triggered by developments in other scientific and humanities fields.

The research agenda for MATH+ has not been fixed in advance for several years, but is designed to be dynamic. New fields and opportunities emerge over time, or need to be actively developed. The *Topic Development Lab (TDL) *is a central part of MATH+ that, based on this dynamic view of mathematics, provides a platform for developing new topics, for building bridges between different fields of mathematics (e.g., between “pure” and “applied”), and for reaching out to other areas of science and potential cooperation partners outside of mathematics. The main activity of the TDL consists of Thematic Einstein Semesters funded by the Einstein Foundation Berlin.

**The current Thematic Einstein Semester (Summer 2023):**

Mathematical Optimization for Machine Learning

The Thematic Einstein Semester *Mathematical Optimization for Machine Learning* aims at unlocking the potential of mathematics within the extremely large and diverse fields of study that constitute modern Computer Science and Data Science. It is intended to bring together young researchers and experienced scholars from mathematics and other disciplines and will consist of specific events, continuous activities over the semester, and research visits.

**Past Thematic Einstein Semesters:**

- Network Games, Tropical Geometry, and Quantum Communication (Summer 2019)
- Algebraic Geometry: Varieties, Polyhedra, Computation (Winter 2019/20)
- Energy-Based Mathematical Methods for Reactive Multiphase Flows (Winter 2020/21)
- Geometric and Topological Structure of Materials (Summer 2021)
- Mathematics of Imaging in Real-Word Challenges (Winter 2021/22)
- The Mathematics of Complex Social Systems: Agent-based and Data-driven Modeling (Summer 2022)
- Scales of Temporality: Modeling Time and Predictability in the Literary and in the Mathematical Sciences (Winter 2022/23)