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Robert Berger (mathematician)
Robert Berger (born 1938) is an applied mathematician, known for inventing the first aperiodic tiling using a set of 20,426 distinct tile shapes.
==Contributions to tiling theory==
The unexpected existence of aperiodic tilings, although not Berger's explicit construction of them, follows from another result proved by Berger: that the so-called domino problem is undecidable, disproving a conjecture of Hao Wang, Berger's advisor. The result is analogous to a 1962 construction used by Kahr, Moore, and Wang, to show that a more constrained version of the domino problem was undecidable.
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