center of G is defined to be Z(G) = {a E G | ag = ga for all ge G}. (a) Show that if X C G is a generating set for G, then Z(G) = {a E G | ax = xa for all x € X}. (b) Find the centers of Sn, Dn, and GLn. (Hint for GLn: There is a theorem from linear algebra that every invertible matrix can be written as a product of ele- mentary matrices. In other words, GLn is generated by elementary matrices.)

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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2. Let G be a group. Recall from Homework 4 Supplementary Problem 1 that the
center of G is defined to be
Z(G) = { a = G | ag = ga for all g = G}.
(a) Show that if X C G is a generating set for G, then
Z(G) = { a G | ax = xa for all x € X}.
(b) Find the centers of Sn, Dn, and GLn. (Hint for GLn: There is a theorem from
linear algebra that every invertible matrix can be written as a product of ele-
mentary matrices. In other words, GLn is generated by elementary matrices.)
Transcribed Image Text:2. Let G be a group. Recall from Homework 4 Supplementary Problem 1 that the center of G is defined to be Z(G) = { a = G | ag = ga for all g = G}. (a) Show that if X C G is a generating set for G, then Z(G) = { a G | ax = xa for all x € X}. (b) Find the centers of Sn, Dn, and GLn. (Hint for GLn: There is a theorem from linear algebra that every invertible matrix can be written as a product of ele- mentary matrices. In other words, GLn is generated by elementary matrices.)
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