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    I Partitions of Euclidean space, cubic lattice, convex sets

    If the Euclidean plane is partitioned into convex sets each of area A in such a way that each contains exactly one vertex of a unit square lattice and this vertex is in its interior, is it true that A must be at least 1/2? If not what is the greatest lower bound for A? The analogous greatest...
  2. M

    Man in the moon

    Why does the Moon keep the same face toward the Earth but the Earth not keep the same face toward the Sun?
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