A: I can't decide! but: "Although 20th-century physicists were surprised by the discovery of quasicrystals, their mathematical descriptions were already well established. In 1961 Hao Wang proved that determining if a set of tiles admits a tiling of the plane is an algorithmically unsolvable problem, implying that aperiodic tilings exist. Two years later an example involving some 20,000 square tiles, each with different colorings, was produced. (These are now called the Wang tiles.)"
whatevs, girl's best friend!
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