Math Problem Statement

determine all the generator of a group of order 17

Solution

To determine all the generators of a group of order 17, let's break it down step-by-step.

Key points:

  1. A group of order 17 is a cyclic group, since 17 is prime. A cyclic group of prime order has the structure Z17\mathbb{Z}_{17}, meaning that every element in the group can be written as powers of a single element (called a generator).

  2. In a cyclic group Zn\mathbb{Z}_n of prime order nn, an element gg is a generator if the smallest positive integer kk such that gk=1g^k = 1 is nn. This means that gg generates all the elements 1,2,3,,161, 2, 3, \ldots, 16 under its powers.

  3. For a cyclic group of order 17, the generators are the elements gZ17g \in \mathbb{Z}_{17} such that gcd(g,17)=1\text{gcd}(g, 17) = 1, where gcd denotes the greatest common divisor.

Step-by-step process:

  1. The group Z17={0,1,2,,16}\mathbb{Z}_{17} = \{0, 1, 2, \ldots, 16\}.
  2. The element 0 does not generate the group, because its powers are always 0.
  3. The element gg generates the group if and only if gcd(g,17)=1\gcd(g, 17) = 1.
  4. The elements gg such that gcd(g,17)=1\gcd(g, 17) = 1 are the integers from 1 to 16, since 17 is prime and the only divisor of 17 is 1.

Conclusion:

The generators of the group Z17\mathbb{Z}_{17} are the elements g{1,2,3,,16}g \in \{1, 2, 3, \ldots, 16\} such that gcd(g,17)=1\gcd(g, 17) = 1. Since 17 is prime, all non-zero elements are coprime to 17. Therefore, the generators are:

g{1,2,3,,16}g \in \{1, 2, 3, \ldots, 16\}

Specifically, the elements 1, 2, 3, ..., 16 are all possible generators of this cyclic group, excluding 0.

Do you have any specific questions on this topic or need further clarification?


Here are some related questions to expand your understanding:

  1. What is the definition of a cyclic group?
  2. How can we determine the order of an element in a group?
  3. What are the properties of a prime order group?
  4. Why are all elements in Z17\mathbb{Z}_{17} (except 0) generators?
  5. Can you explain how the greatest common divisor (gcd) helps find generators?

Tip: In a cyclic group of prime order, all non-identity elements are generators!

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Math Problem Analysis

Mathematical Concepts

Group Theory
Cyclic Groups
Prime Numbers
Greatest Common Divisor (GCD)

Formulas

gcd(g, n) = 1 (g is a generator if gcd(g, n) = 1)

Theorems

A cyclic group of prime order n has n-1 generators
In a cyclic group of prime order, all non-zero elements are generators

Suitable Grade Level

Undergraduate Level (Abstract Algebra)