- #1
Palindrom
- 263
- 0
Hi all,
Suppose E/F and K/E are finite separable extensions. Prove: K/F is a separable extension.
I tried, but I'm stuck again. (Have you noticed I have one like this every week? And it seems I'm the only one that's even trying to submit these H.W. weekly...).
Anyway, that was my direction: Given [tex]\[
\theta \in K
\]
[/tex], I know that [tex]\[
\mu _\theta \left( x \right)
\]
[/tex] (the minimal polynomial over E) is separable. What I need to prove is that [tex]\[
\hat \mu _\theta \left( x \right)
\]
[/tex], which is the minimal polynomial over F, is separable.
I know that [tex]\[
\mu '_\theta \left( x \right) \ne 0
\]
[/tex], since [tex]\[
\mu _\theta \left( x \right)
\]
[/tex]is separable and therefore [tex]\[
\left( {\mu ,\mu '} \right) = 1
\]
[/tex]. I now need to prove that [tex]\[
\hat \mu '_\theta \left( x \right) \ne 0
\]
[/tex].
...
Tried all kinds of things, didn't get me far though... Any hints would be appreciated.
Suppose E/F and K/E are finite separable extensions. Prove: K/F is a separable extension.
I tried, but I'm stuck again. (Have you noticed I have one like this every week? And it seems I'm the only one that's even trying to submit these H.W. weekly...).
Anyway, that was my direction: Given [tex]\[
\theta \in K
\]
[/tex], I know that [tex]\[
\mu _\theta \left( x \right)
\]
[/tex] (the minimal polynomial over E) is separable. What I need to prove is that [tex]\[
\hat \mu _\theta \left( x \right)
\]
[/tex], which is the minimal polynomial over F, is separable.
I know that [tex]\[
\mu '_\theta \left( x \right) \ne 0
\]
[/tex], since [tex]\[
\mu _\theta \left( x \right)
\]
[/tex]is separable and therefore [tex]\[
\left( {\mu ,\mu '} \right) = 1
\]
[/tex]. I now need to prove that [tex]\[
\hat \mu '_\theta \left( x \right) \ne 0
\]
[/tex].
...
Tried all kinds of things, didn't get me far though... Any hints would be appreciated.