Free Group
The most general group generated by a set S is the group freely generated by S. Every group generated by S is isomorphic to a quotient of this group, a feature which is utilized in the expression of a group's presentation.
Read more about this topic: Generating Set Of A Group
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—Aeschylus (525–456 B.C.)
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—The Lions Clubs International and the Quest Nation. The Surprising Years, I, ch.5 (1985)