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Jan 19, 2010 at 15:30 comment added user2035 It means direct product. You get direct sums if you consider the direct limit of finite-dimensional tori.
Jan 17, 2010 at 18:33 vote accept Aaron Mazel-Gee
Jan 17, 2010 at 18:33 comment added Aaron Mazel-Gee Thanks. Just out of curiosity, does the exponent notation mean direct sum or direct product? The group construction works in either case, of course, and the latter interpretation can evidently arise from some sort of infinite torus -- what about the former?
Jan 15, 2010 at 8:26 history edited user2035 CC BY-SA 2.5
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Jan 15, 2010 at 8:09 history answered user2035 CC BY-SA 2.5