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3 Table of Contents: “... for DT categories -- Categori ed Hall products on DT categories -- Some auxiliary results...”

4 Table of Contents: “... theories -- Constructing Buildings and Harmonic Maps -- Cohomological Hall algebras, semicanonical bases...”

5 Table of Contents: “...; Chapter 7. Hall triple systems and related topics; Chapter 8. On mappings preserving a single Lorentz...”

6 Table of Contents: “... on cohomological Hall algebras and their representations -- A stratification on the moduli of K3 surfaces...”

7 Table of Contents: “..., O. Schiffmann, E. Vasserot: Spherical Hall Algebra of Spec(Z) -- Maxim Kontsevich and Yan Soibelman...”

8 Table of Contents: “...-Prohaska -- 52. Prohaska’s Characterization of the Hall Planes -- Index of Special Symbols...”

9 Table of Contents: “... geometry -- Towards the fractional quantum Hall effect: a noncommutative geometry perspective...”

10 Table of Contents: “... and Midlines in a Finite Hyperbolic Plane; Chapter 20. Hall-Ryser Type Theorems for Relative Difference Sets...”

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