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Projective Group

  • Definition: Let F be a field. The center of the special linear group 2, SL_2(F), is {+-I}. The quotient group SL_2(F)/{+-I} is called the projective group, and is denoted by PSL_2(F). Its elements are the cosets {+-P}.

    Source: Algebra, second edition by Michael Artin

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