Before becoming a hero of the Star Wars Universe, R2-D2 had a single goal in its robotic life: repair spaceships damaged in battle or elsewhere, including while said ships were still on the move. And ...
The recently discovered “hat” aperiodic monotile admits tilings of the plane, but none that are periodic [SMKGS23]. This polygon settles the question of whether a single shape—a closed topological ...
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