It's a paper by Terrence Tao, and Rachel Greenfeld. Terrence Tao features here often.
They disproved a longstanding conjecture in geometry known as the periodic tiling conjecture. This conjecture stated that it was impossible to devise a tile that could cover a higher-dimensional space aperiodically, but not periodically. The two mathematicians were able to construct a tile that could do just this, breaking the conjecture. This finding has implications for the understanding of patterns and symmetry in higher-dimensional spaces.
They disproved a longstanding conjecture in geometry known as the periodic tiling conjecture. This conjecture stated that it was impossible to devise a tile that could cover a higher-dimensional space aperiodically, but not periodically. The two mathematicians were able to construct a tile that could do just this, breaking the conjecture. This finding has implications for the understanding of patterns and symmetry in higher-dimensional spaces.