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Feb 28, 2013 at 5:03 comment added user31813 @François G. Dorais: Although it is not (or may not be) research level, finding an answer to it is very hard by searching. or getting an answer in math.EX. However thanks for your answer.
Feb 28, 2013 at 3:11 history edited user31813 CC BY-SA 3.0
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Feb 28, 2013 at 2:48 history edited user31813 CC BY-SA 3.0
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Feb 28, 2013 at 2:29 vote accept user31813
Feb 28, 2013 at 0:08 comment added François G. Dorais This is not really "research level" but I coincidentally worked through this proof earlier today. In the future, you may want to consider math.stackexchange.com for arguments that can easily be found in books you don't happen to have access to. People there also tend to give more detailed answers than here.
Feb 28, 2013 at 0:00 history edited François G. Dorais CC BY-SA 3.0
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Feb 28, 2013 at 0:00 answer added François G. Dorais timeline score: 7
Feb 27, 2013 at 22:55 history edited user31813
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Feb 27, 2013 at 22:45 history asked user31813 CC BY-SA 3.0