Exercise 13.4.22. (a) In the group D₁, let r be counterclockwise rotation by 2π/n and let s be the reflection that leaves vertex 1 fixed. Is rs³r²s a reflection or rotation? Prove your answer. (b) Let p be an arbitrary rotation in Dn, and let o be an arbitrary reflection in Dn. Is p²o³p²o a reflection or rotation? Prove your answer. (c) Let k, l, m, n be integers. Given the symmetry pks pmsn, under what conditions is this symmetry a reflection? Under what conditions is this symmetry a rotation? Prove your answers.
Exercise 13.4.22. (a) In the group D₁, let r be counterclockwise rotation by 2π/n and let s be the reflection that leaves vertex 1 fixed. Is rs³r²s a reflection or rotation? Prove your answer. (b) Let p be an arbitrary rotation in Dn, and let o be an arbitrary reflection in Dn. Is p²o³p²o a reflection or rotation? Prove your answer. (c) Let k, l, m, n be integers. Given the symmetry pks pmsn, under what conditions is this symmetry a reflection? Under what conditions is this symmetry a rotation? Prove your answers.
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 16E
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