Question

In: Advanced Math

Show that the map Q[X] → Q[X], sum^{n}{i=0}(a_nX^i) → sum^{n}{i=0}(a_n(2X + 3)^i) , is an automorphism...

Show that the map Q[X] → Q[X],

sum^{n}{i=0}(a_nX^i) → sum^{n}{i=0}(a_n(2X + 3)^i) , is an automorphism of Q[X],

Solutions

Expert Solution

Given function ,

We need to show that is an automorphism. We first prove that it is a homomorphism.

Suppose are given by

Then

and

Therefore, is a ring homomorphism.

Thus, to prove that is automorphism, it remains to show that it is bijective. We can do this by showing that has a two-sided inverse.

Consider the function ,

For any element , given by

we have

and

Thus, is a two-sided inverse of . Hence, is an automorphism.


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