Images of elements in a group homomorphism

In summary, in a homomorphism, the image of elements depends on the image of 1, but other generators would work as well. This is because 1 is easy to handle in calculations, as shown by the example using ##\varphi(7)##. The use of 1 is not necessary, but it is out of convenience.
  • #1
Terrell
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Why does the image of elements in a homomorphism depend on the image of 1? Why not the other generators?
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Other generators would work as well, but ##1## is especially easy to handle:
$$\varphi(a)=\varphi(a\cdot 1)=\varphi (\underbrace{1+\ldots +1}_{a\text{ times }})=\underbrace{\varphi(1)+\ldots +\varphi(1)}_{a\text{ times }}=a\cdot \varphi(1)$$
Now convince me with such a calculation by the use of ##\varphi(7)##.
 
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  • #3
fresh_42 said:
Other generators would work as well, but ##1## is especially easy to handle:
$$\varphi(a)=\varphi(a\cdot 1)=\varphi (\underbrace{1+\ldots +1}_{a\text{ times }})=\underbrace{\varphi(1)+\ldots +\varphi(1)}_{a\text{ times }}=a\cdot \varphi(1)$$
Now convince me with such a calculation by the use of ##\varphi(7)##.
I was not sure it was out of pure convenience. Thanks!
 

1. What is a group homomorphism?

A group homomorphism is a mathematical function that maps elements from one group to another in a way that preserves the group structure. This means that the operation on elements in the first group will also be preserved in the second group when the function is applied.

2. What are images of elements in a group homomorphism?

The image of an element in a group homomorphism is the result of applying the function to that element. In other words, it is the element in the second group that corresponds to the element in the first group after the function has been applied.

3. How are images of elements in a group homomorphism calculated?

To calculate the image of an element in a group homomorphism, you would simply apply the function to that element. Depending on the specific function and groups involved, this may involve performing mathematical operations or transformations.

4. What is the significance of images of elements in a group homomorphism?

The images of elements in a group homomorphism help us understand the relationship between two groups. They show us how the elements in one group are related to the elements in the other group through the function. This can be useful in solving mathematical problems and proving theorems.

5. How are images of elements in a group homomorphism used in real-world applications?

Group homomorphisms are used in various fields of science and technology, such as cryptography, signal processing, and physics. In these applications, images of elements in a group homomorphism can help us understand and manipulate data, signals, or physical phenomena in a structured and efficient manner.

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