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Diophantine equations, rational points, abelian varieties, Arakelov theory, Iwasawa theory.

0 votes
2 answers
524 views

Is $S^1=\mathbb{R}/\mathbb{Z}$ a ring? [closed]

Is there a ring structure on $S^1=\mathbb{R}/\mathbb{Z}$?
Ola Sande's user avatar
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2 votes
0 answers
177 views

Why are they called reductive groups? [duplicate]

The reductive groups play a central role in the Langlands correspondence. Why are these groups called reductive? Does this name suggest something conceptual about these groups?
Ola Sande's user avatar
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