- #1
I was not sure it was out of pure convenience. Thanks!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)##.
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.
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.
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.
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.
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.