When tourists become lost, overwhelmed, tired, inspired, bored, enlightened, confronted, hungry, upset or tipsy, when they get cheated or fall in love, perceptions change and surprising associations and experiences come to light. In trying to figure out a city, they are mostly investigating themselves. In this madcap tour through five important international cities, Martin Lorenz and one guest artist per city gave themselves 48 hours to experience their destination, to document it and create a visual diary without the use of computers. The resulting evidence reveals places and situations that...

Multiplicative invariant theory, as a research area in its own right within the wider spectrum of invariant theory, is of relatively recent vintage. The present text offers a coherent account of the basic results achieved thus far..

Multiplicative invariant theory is intimately tied to integral representations of finite groups. Therefore, the field has a predominantly discrete, algebraic flavor. Geometry, specifically the theory of algebraic groups, enters through Weyl groups and their root lattices as well as via character lattices of algebraic tori.

Throughout the text,...

Multiplicative invariant theory, as a research area in its own right within the wider spectrum of invariant theory, is of relatively recent vintage. The present text offers a coherent account of the basic results achieved thus far..

Multiplicative invariant theory is intimately tied to integral representations of finite groups. Therefore, the field has a predominantly discrete, algebraic flavor. Geometry, specifically the theory of algebraic groups, enters through Weyl groups and their root lattices as well as via character lattices of algebraic tori.

Throughout the text,...