Integral Domain: Solving a^2=1 with at Most 2 Solutions

In summary, an Integral Domain is a mathematical structure that follows certain rules and is a generalization of a field. When a^2 = 1 in an Integral Domain, it means the element "a" is its own inverse. An element in an Integral Domain can only have one square root. An Integral Domain is different from a Field in that the division operation is not defined for all elements. However, every Integral Domain is also a Commutative Ring, as it satisfies all the properties of a Commutative Ring.
  • #1
Rederick
12
0

Homework Statement



Let R be an integral domain with identity element 1. Show that there at most two elements "a" in R such that a^2=1


Homework Equations





The Attempt at a Solution



Being an integral domain implies that if ab=0, then a=0 or b=0. a^2=1 implies a=1. Then (a)(a) = (1)(1). This seems like a simple problem but I'm not sure how to properly state that there are "at most 2 elements."
 
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  • #2
Saying that a2=1, is thesame as saying that a2-1=0. Maybe you can factorize the left hand side...
 
  • #3
Thank you. Got it
 

1. What is an Integral Domain?

An Integral Domain is a type of mathematical structure that consists of a set of elements, operations, and properties that follow certain rules. It is a generalization of the concept of a field, where the division operation is not always defined for all elements.

2. What does it mean when a^2 = 1 in an Integral Domain?

When a^2 = 1 in an Integral Domain, it means that the element "a" is its own inverse. In other words, when "a" is multiplied by itself, the result is equal to the multiplicative identity element, which is 1.

3. Can an element in an Integral Domain have multiple square roots?

No, in an Integral Domain, an element can only have one square root. This is because the property a^2 = 1 implies that the element "a" is its own inverse, and there can only be one inverse for any given element.

4. How is an Integral Domain different from a Field?

An Integral Domain is a generalization of a Field, where the only difference is that the division operation is not defined for all elements in an Integral Domain. In a Field, every non-zero element has a defined inverse for both multiplication and addition.

5. Is every Integral Domain also a Commutative Ring?

Yes, every Integral Domain is also a Commutative Ring. This is because an Integral Domain satisfies all the properties of a Commutative Ring, such as closure, associativity, commutativity, and distributivity.

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