Let n > 1 be an integer. We say that [x] ∈ℤ/n is a zero divisor if there exists [y] ∈ ℤ/n − {[0]} such that [x][y] = [0]. We say that [x] is a unit if there exists [y] ∈ ℤ/n such that [x][y] = [1]. 7a) What are all the units in ℤ/12? What are all the zero divisors? b) What are all the units in ℤ/14? What are all the zero divisors? c) What are all the units in ℤ/13? What are all the zero divisors?
Let n > 1 be an integer. We say that [x] ∈ℤ/n is a zero divisor if there exists [y] ∈ ℤ/n − {[0]} such that [x][y] = [0]. We say that [x] is a unit if there exists [y] ∈ ℤ/n such that [x][y] = [1]. 7a) What are all the units in ℤ/12? What are all the zero divisors? b) What are all the units in ℤ/14? What are all the zero divisors? c) What are all the units in ℤ/13? What are all the zero divisors?
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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Let n > 1 be an integer. We say that [x] ∈ℤ/n is a zero divisor if there exists [y] ∈ ℤ/n − {[0]} such that [x][y] = [0]. We say that [x] is a unit if there exists [y] ∈ ℤ/n such that [x][y] = [1].
7a) What are all the units in ℤ/12? What are all the zero divisors?
b) What are all the units in ℤ/14? What are all the zero divisors?
c) What are all the units in ℤ/13? What are all the zero divisors?
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