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Udo Pachner proved that all simplicial manifolds which are homeomorphic canbe transformed into each other by a sequence of simple transformations nowcommonly called "Pachner moves". For a fixed dimension there are only finitelymany types of Pachner moves. This makes it possible to identify invariants byproving the invariance only for a finite number of transformations. This facthas proved useful for various applications in p.l. topology and in loop quantumgravity theory. The paper is meant to honor the importance of Pachner's resultsand to make them known to a wider community.

Udo Pachner (1947-2002) - A "Hidden Champion" in Mathematics