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| | Learn more about Group (mathematics) in the online encyclopedia. (Site not responding. Last check: 2007-10-30) |
 | | A great many of the objects investigated in mathematics turn out to be groups, including familiar number systems, such as the integers, rational, real, and complex numbers under addition, non-zero rational, real, and complex numbers under multiplication, non-singular matricies under multiplication, invertable functions under composition, and so on. |
 | | For these reasons, group theory is considered to be an important area in modern mathematics. |
 | | The direct sum of two groups (G,*) and (H,•) is the set G×H together with the operation (g |
| www.onlineencyclopedia.org /g/gr/group__mathematics_.html (1715 words) |
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