J. Properties of Divisors of Zero Prove that each of the following is true in a nontrivial ring. 1 If a 1 and a² = 1, then a + 1 and a 1 are divisors of zero. #2 If ab is a divisor of zero, then a or b is a divisor of zero. 3 In a commutative ring with unity, a divisor of zero cannot be invertible.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter6: More On Rings
Section6.4: Maximal Ideals (optional)
Problem 13E
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J. Properties of Divisors of Zero
Prove that each of the following is true in a nontrivial ring.
1 If a 1 and a² = 1, then a + 1 and a 1 are divisors of zero.
#2 If ab is a divisor of zero, then a or b is a divisor of zero.
3 In a commutative ring with unity, a divisor of zero cannot be invertible.
4 Suppose ab #0 in a commutative ring. If either a or is a divisor of zero, so is ab.
5 Suppose a is neither 0 nor a divisor of zero. If ab = ac, then b = c.
6 Ax B always has divisors of zero.
Transcribed Image Text:J. Properties of Divisors of Zero Prove that each of the following is true in a nontrivial ring. 1 If a 1 and a² = 1, then a + 1 and a 1 are divisors of zero. #2 If ab is a divisor of zero, then a or b is a divisor of zero. 3 In a commutative ring with unity, a divisor of zero cannot be invertible. 4 Suppose ab #0 in a commutative ring. If either a or is a divisor of zero, so is ab. 5 Suppose a is neither 0 nor a divisor of zero. If ab = ac, then b = c. 6 Ax B always has divisors of zero.
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