2. Let U be a ring with unity 1 and zero element 0.. (a) If 0 = 1, then U consists of only one element. (b) If 0 is a unit, then U = {0}. (c) If U = {0}, then 0 is the unity and a unit. oll unite in A Show 1

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.1: Definition Of A Ring
Problem 23E: Let R be a ring with unity and S be the set of all units in R. a. Prove or disprove that S is a...
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2. Let U be a ring with unity 1 and zero element 0..
(a) If 0 = 1, then U consists of only one element.
(b) If 0 is a unit, then U = {0}.
(c) If U = {0}, then 0 is the unity and a unit.
3. Let <A,+,> be a ring with unity and let A* be the set of all units in A. Show that the
set <A*,> is a group.
Transcribed Image Text:2. Let U be a ring with unity 1 and zero element 0.. (a) If 0 = 1, then U consists of only one element. (b) If 0 is a unit, then U = {0}. (c) If U = {0}, then 0 is the unity and a unit. 3. Let <A,+,> be a ring with unity and let A* be the set of all units in A. Show that the set <A*,> is a group.
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