Find the order of each of the following elements. [from #2, 4.5] a) 5 € Z12 b) -i E C*

Advanced Engineering Mathematics
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Author:Erwin Kreyszig
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### Finding the Order of Elements

#### Problem 5:

Find the order of each of the following elements. 
Refer to sections [#2, 4.5] for additional context and examples.

a) \( 5 \in \mathbb{Z}_{12} \)

b) \( -i \in \mathbb{C}^* \)

---

**Explanation:**

This problem requires determining the order of specific elements in given mathematical structures.

1. **For the element \( 5 \in \mathbb{Z}_{12} \):**
   - \(\mathbb{Z}_{12}\) denotes the cyclic group of integers modulo 12.
   - The order of an element \(a\) in a group is the smallest positive integer \(k\) such that \(a^k = e\) (where \(e\) is the identity element).

2. **For the element \( -i \in \mathbb{C}^* \):**
   - \(\mathbb{C}^*\) denotes the multiplicative group of non-zero complex numbers.
   - The order of an element \(g\) in this group is the smallest positive integer \(m\) such that \(g^m = 1\) (where 1 is the identity element under multiplication).

To solve these problems, you would usually:
- Calculate or find the smallest exponent that satisfies the given conditions for each element in their respective group.

Refer to your course notes or textbook for methodologies specific to cyclic groups and multiplicative groups of complex numbers.
Transcribed Image Text:### Finding the Order of Elements #### Problem 5: Find the order of each of the following elements. Refer to sections [#2, 4.5] for additional context and examples. a) \( 5 \in \mathbb{Z}_{12} \) b) \( -i \in \mathbb{C}^* \) --- **Explanation:** This problem requires determining the order of specific elements in given mathematical structures. 1. **For the element \( 5 \in \mathbb{Z}_{12} \):** - \(\mathbb{Z}_{12}\) denotes the cyclic group of integers modulo 12. - The order of an element \(a\) in a group is the smallest positive integer \(k\) such that \(a^k = e\) (where \(e\) is the identity element). 2. **For the element \( -i \in \mathbb{C}^* \):** - \(\mathbb{C}^*\) denotes the multiplicative group of non-zero complex numbers. - The order of an element \(g\) in this group is the smallest positive integer \(m\) such that \(g^m = 1\) (where 1 is the identity element under multiplication). To solve these problems, you would usually: - Calculate or find the smallest exponent that satisfies the given conditions for each element in their respective group. Refer to your course notes or textbook for methodologies specific to cyclic groups and multiplicative groups of complex numbers.
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