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What is the order of a in (Z/nZ)*?

oct 29 10 at 7:44 Franz Lemmermeyer 17.3k●1●38●102

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Is there a name for this type of matrix? (Reference Request)

jul 26 11 at 19:14 Jeremy West 195●1●9

 
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Examples of DVRs of residue char p and ramification e

oct 25 10 at 12:08 Mikhail Bondarko 5,936●1●4●21