Show that Z,[V3] = {a + bV3| a, b E Z,} is a field. For any positive integer k and any prime p, determine a necessary and suf- ficient condition for Z,[Vk] = {a + bVk|a, b E Z,} to be a field.
Show that Z,[V3] = {a + bV3| a, b E Z,} is a field. For any positive integer k and any prime p, determine a necessary and suf- ficient condition for Z,[Vk] = {a + bVk|a, b E Z,} to be a field.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter6: More On Rings
Section6.3: The Characteristic Of A Ring
Problem 18E
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Step 1
We need to show that is a field.
To show that is a field, we need to verify the following:
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is a commutative ring with identity.
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Every nonzero element in has a multiplicative inverse.
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To show that is a commutative ring with identity, we need to show that it satisfies the following axioms:
- Addition is commutative and associative.
- There exists an additive identity element 0.
- Every element has an additive inverse.
- Multiplication is commutative and associative.
- There exists a multiplicative identity element 1.
- Every nonzero element has a multiplicative inverse. It is straightforward to verify that satisfies all these axioms.
Step 2
To show that every nonzero element in has a multiplicative inverse, we need to show that for any nonzero element in , there exists an element in such that . This can be done by solving the equation for c and d. We get and , where the division is taken in . It can be verified that these values of c and d satisfy the equation, and hence every nonzero element in has a multiplicative inverse.
Therefore, is a field.
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