Assume that N is a normal subgroup of a group G. Assume E is asubgroup of G/N. As in Problem 10.3.11 , let K be the union of all thecosets in E. Show that K is normal in G if and only if E is normal inG/N.

Assume that N is a normal subgroup of a group G. Assume E is asubgroup of G/N. As in Problem 10.3.11 , let K be the union of all thecosets in E. Show that K is normal in G if and only if E is normal inG/N.

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Question

Assume that N is a normal subgroup of a group G. Assume E is a
subgroup of G/N. As in Problem 10.3.11 , let K be the union of all the
cosets in E. Show that K is normal in G if and only if E is normal in
G/N.

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