By Brian Osserman

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Using the factor group G written multiplicatively we may say that if the elements 2 0

Now we are ready to develop the test created by Szabo [8] for telling whether a Q-lattice tiling by C is a Z-tiling. Lemma 2. Let C be a cluster in R that contains the η + 1 vectors ( 0 , . . , 0), e i , . . , e . / / C* in (2) is a subgroup of G = L'/L, then L c Z , that is, the Q-lattice tiling by translates ofCby the vectors in Lisa Z-latticetiling. n n n Proof. Each vector I e L can be written uniquely in the form I = zi{l/ri)ei + · · · + z (l/r„)e , n n where t h e Zj's are integers. We wish to prove that η divides Zj.

However, in 1992 Lagarias and Shor [9], using an approach of Corrädi and Szabo [2], showed that Keller's conjecture is false in all dimensions greater than or equal to 10. ) Similarly, Redei wondered whether the sets of prime orders in Hajos's theorem had to be cyclic. In 1965 he showed [17] that the assumption could b e removed, proving the following theorem. Redei's Theorem. , A be normalized subsets of G of prime orders. Assume that G ~ A1A2 • • A is a factorization. Then at least one of the sets A, is a subgroup.