The set of equivalence classes Zn = {[0], [1], - - · , [n – 1]} is an example of what is ... called a finite ring (which simply means the elements can be added and multiplied in familiar ways). (Def.) Two non-zero elements a and b in a ring are called zero divisors if a·b = 0. For example, in Z12 the elements [2] and [6] are zero divisors. Prove the following theorem. Theorem. If n is composite, then there exists at least one pair of zero divisors in Zn.

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The set of equivalence classes Zn = {[0], [1], - - · , [n – 1]} is an example of what is
...
called a finite ring (which simply means the elements can be added and multiplied in familiar
ways).
(Def.) Two non-zero elements a and b in a ring are called zero divisors if a·b = 0. For example,
in Z12 the elements [2] and [6] are zero divisors. Prove the following theorem.
Theorem. If n is composite, then there exists at least one pair of zero divisors in Zn.
Transcribed Image Text:The set of equivalence classes Zn = {[0], [1], - - · , [n – 1]} is an example of what is ... called a finite ring (which simply means the elements can be added and multiplied in familiar ways). (Def.) Two non-zero elements a and b in a ring are called zero divisors if a·b = 0. For example, in Z12 the elements [2] and [6] are zero divisors. Prove the following theorem. Theorem. If n is composite, then there exists at least one pair of zero divisors in Zn.
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