theorem 1.31 The set of all rotations about the origin and reflections in lines through the origin is a group called orthogonal group and is denoted by O(2). SO(2) is a subgroup of index 2 in O(2). Det'n: Let P be any point in E². The set P of all lines that passes through P is called pencil of lines through P. We denote REF(P) : REF(P) the smallest group of isometries containing all , wherele P. We denote ROT(P) the set of all rotations about P.
theorem 1.31 The set of all rotations about the origin and reflections in lines through the origin is a group called orthogonal group and is denoted by O(2). SO(2) is a subgroup of index 2 in O(2). Det'n: Let P be any point in E². The set P of all lines that passes through P is called pencil of lines through P. We denote REF(P) : REF(P) the smallest group of isometries containing all , wherele P. We denote ROT(P) the set of all rotations about P.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.6: Quotient Groups
Problem 23E
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