A simple domain not being skew field?

In summary, the conversation discusses the search for an example of a simple domain that is not a skew field. There is a mention of the noncommutative case and the definition of a simple domain as a ring without zero divisors. It is suggested that M_n(F) may not be a suitable example and more creativity is needed to find one.
  • #1
peteryellow
47
0
Can you find an example of a simple domain not being skew field?
 
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  • #2
Like in your other thread: What are your thoughts on this? Can you list examples of simple rings? Domains?

What if we assume commutativity, i.e. can you find a simple integral domain that isn't a field? You shouldn't - but this might shed some light on the noncommutative case.
 
  • #3
Simple ring M_n(F) where F is a field, but what is the definition of a simple domain?
 
  • #4
A domain is a ring without zero divisors, i.e. xy=0 implies either x=0 or y=0. A simple domain is a domain that is a simple ring.

Unfortunately M_n(F) isn't a domain, so you're going to have to be more creative if you want to come up with an example!
 

1. What is a simple domain?

A simple domain is a mathematical structure known as a division ring, which is a generalization of a field. It is a set of elements with operations of addition, subtraction, multiplication, and division that follow specific properties.

2. How is a simple domain different from a skew field?

A simple domain is a special type of skew field, in which every nonzero element has a multiplicative inverse. In other words, every element can be multiplied by a unique element to obtain the identity element. This property is not always true in a skew field.

3. Can a simple domain be finite?

Yes, a simple domain can be finite. For example, the integers modulo a prime number form a finite simple domain. However, most simple domains are infinite, such as the real or complex numbers.

4. What are some examples of simple domains?

The most well-known example of a simple domain is the field of real numbers. Other examples include the complex numbers, quaternions, and octonions. The integers modulo a prime number and the rational numbers are also simple domains.

5. What is the significance of a simple domain not being a skew field?

A simple domain not being a skew field means that it does not have the property of commutativity, where the order of multiplication does not matter. This can have important implications in certain mathematical structures and applications, such as in abstract algebra and physics.

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