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October 28

October 28 is the 301st day of the year (302nd in leap years) in the Gregorian Calendar, with 64 days remaining.





See Also: January, February, March, April, May, June, July, August, September, October, November, December

October 27 - October 29 - November 28 - September 28 - more historical anniversaries

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Rank of an abelian group

... silly examples include torsion-free rank 2 groups A_(n,m) and B_(n,m) such that A^n is isomorphic to B^n if and only if n is divisible by m. When one allows infinite ...