This about abstract algebra. Reference book: Contemporary Abstract Algebra of Joseph A.Gallian.
(a) Let A be any counter-symmetric deranged matrix. Write A as a linear combination of the
matrices I, P(123) and P(132)
(b) Let A be any symmetric deranged matrix. Write A as a linear combination of the matrices
P(12) , P(23) , P(13) .
(c) Let D be the subgroup of all deranged matrices in GL(3, R); let D1 be the subgroup of
counter-symmetric deranged matrices in D. Show that for any odd permutation ? ? S3 ,
3. Let D = D1 ? (P? D1 ) (ii) D1 C D (iii) D/D1 ? Z2 a c b
a b c
A = b a c or b c a c b a
c a b be a deranged matrix.
(a) Show that A is orthogonal if and only if a2 + b2 + c2 = 1 and a + b + c = ±1.
(b) Find three distinct2 triples (a, b, c) consisting of rational numbers that satisfy the conditions
of part (a).
4. As demonstrated in class the symmetry group of a cube, S(C), consists of the following 48 matrices 0
0 ±1 0
0 0 ±1 0 , 0
0 ±1 , ±1 0
0 ±1 0
0 ±1 ±1 0
0 ±1 , 0 ±1 0 , ±1
0 ±1 0
with usual matrix multiplication. Show that
S(C) ? S4 ? Z2 .
Recall: the rotations in S(C) are the 24 matrices with determinant equal to 1. 2 That is, (1, 0, 0) is one solution, but (0, ±1, 0) counts as the same solution.
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Sep 21, 2019EXPERT
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