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An elementary geometric construction is used to relate the space of lattices in R 2 to the space exp 3 S 1 of the subsets of a circle of cardinality at most 3. As a consequence we obtain a new proof(More)
Let us begin with definitions. Fix two points A and B in R. We shall always assume that A = (0, 0, 0) and B = (1, 0, 0) so, in particular, the line AB is the x-axis and the length of the interval(More)