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This workshop concerns prominent indexing categories with applications to interesting problems in commutative algebra and algebraic topology. The prime example sparking our interest is the work of Snowden, Church, Ellenberg and others on GL-structures and FI-modules, which involves variations on categories of finite sets and injections. These occur prominently in algebraic topology whenever algebraic structures up to homotopy have to be encoded. Our aim is to bring researchers with different backgrounds but a common interest in special indexing categories together and catalyze a fruitful exchange. Invited speakers include:

• Rob H. Eggermont (Eindhoven University of Technology, The Netherlands)
• Moritz Groth (University of Bonn, Germany)
• Javier J. Gutiérrez (Universidad de Cantabria, Spain)
• Henning Krause (University of Bielefeld, Germany)
• Liping Li (Hunan Normal University, China)
• Ieke Moerdijk (University of Utrecht, The Netherlands)
• Uwe Nagel (University of Kentucky, USA)
• Dang Hop Nguyen (Hanoi Institute of Mathematics, Vietnam)
• Steffen Sagave (University of Bonn, Germany)
• Stefan Schwede (University of Bonn, Germany)