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This collection of high-quality articles in the field of combinatorics, geometry, algebraic topology and theoretical computer science is a tribute to Ji í Matoüek, who passed away prematurely in March 2015. It is a collaborative effort by his colleagues and friends, who have paid particular attention to clarity of exposition something Jirka would have approved of.
The original research articles, surveys and expository articles, written by leading experts in their respective fields, map Ji í Matoüek s numerous areas of mathematical interest.