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In [[mathematics]], a '''unipotent element''' ''r'' of a [[ring (mathematics)|ring]] ''R'' is one such that ''r''&nbsp;−&nbsp;1 is a [[nilpotent element]]; in ...oup of some <math>\mathbb{U}_n</math>. Using [[Scheme (mathematics)|scheme theory]] the group <math>\mathbb{U}_n</math> can be defined as the group scheme<bl ...

...ration]] defined for [[arithmetic function]]s; it is important in [[number theory]]. It was developed by [[Peter Gustav Lejeune Dirichlet]]. ...'n'' > 1}}. The [[unit (ring theory)|unit]]s (invertible elements) of this ring are the arithmetic functions ''f'' with {{nowrap|''f''(1) ≠ 0}}. ...

{{See also|History of electromagnetic theory}} ...hematical basis for electromagnetic theory, the detailed mechanisms of the theory were still being explored. One such question was about the details of the i ...

...tune's atmosphere or the breakup of Triton, forming a new [[planetary ring|ring]] system similar to that found around [[Saturn]].<ref name="Chyba"/> ...t therefore have originated in the [[Kuiper belt]],<ref name="Agnor06"/> a ring of small icy objects extending from just inside the orbit of Neptune to abo ...