Exercise about split closures (Galois Theory)












1














I am studing Galois Theory. I am using the books by Kaplansky, Fields and Rings. I am stuck doing this exercise:



Let $M$ be a split closure of $L$ over $K$ ($M,L,K$ are all fields). Prove that $M=L_1cup dots cup L_r$ where $L_i$ is isomorphic to $L$ over $K$.



The actuall problem is that I do not have fully understood the concept of split closure; in the book it is defined in this way.



Let $K subset L$ be fields and $[L:K]$ finite.There exists a field $M$ containing $L$ such that $M$ is a splitting field over $K$ and no field othen than $M$ between $M$ and $L$ is a splitting field over $K$. If $M_0$ is a second such field, then there exists an isomorphism of $M$ onto $M_0$ which is the identity on $L$. If $L$ is separable then $M$ is normal over $K$.



We shall call a field having the properties of $M$ a split closure of $L$ over $K$. If $L$ is separable we call $M$ normale closure.



Then problem is that the professor in class did not do man examples, so could you please give me some example of split/normal closure, emphasize their difference and the idea behind the introduction of this concept.



Thank you!






field-theory galois-theory







share|cite|improve this question
























  • What is a secondsuc field?
    – Kenny Lau
    yesterday






  • 1




    The usual terminology is normal closure. Assume that $L = K(alpha)$. Then $M = K(alpha_1,ldots,alpha_n) = prod_{j=1}^n K(alpha_j)$ (compositum of fields) where $alpha_1,ldots,alpha_n$ are the roots of the minimal polynomial $f in K[x]$ of $alpha$ so $K(alpha_j) cong K(alpha)$.
    – reuns
    yesterday












  • In general $L$ doesn't have to be generated by a single element but you can use induction : that if $prod_{j=1}^n F_j$ is normal over $K$ and $F_j cong F_1$ then the normal closure of $prod_{j=1}^n F_j(beta)$ is $prod_{j=1}^n prod_{l=1}^m F_j(beta_{j,l})$ where $beta_{j,l}$ are the roots of $sigma_j(h) in F_j[x]$ and $h in F_1[x]$ is the minimal polynomial of $beta$ and $sigma_j$ is the given isomorphism $F_1 to F_j$.
    – reuns
    yesterday












  • The claim is a bit strange. If the field $K$ is infinite and $L/K$ is not Galois, then $[M:L]>1$ and hence $M$ cannot be written as a finite union of proper subspaces over $K$ let alone subfields. In other words the claim is false in that case. On the other hand, if $K$ is finite, then $L/K$ is Galois, and hence equal to its normal closure, making the claim trivial.
    – Jyrki Lahtonen
    19 hours ago


















1














I am studing Galois Theory. I am using the books by Kaplansky, Fields and Rings. I am stuck doing this exercise:



Let $M$ be a split closure of $L$ over $K$ ($M,L,K$ are all fields). Prove that $M=L_1cup dots cup L_r$ where $L_i$ is isomorphic to $L$ over $K$.



The actuall problem is that I do not have fully understood the concept of split closure; in the book it is defined in this way.



Let $K subset L$ be fields and $[L:K]$ finite.There exists a field $M$ containing $L$ such that $M$ is a splitting field over $K$ and no field othen than $M$ between $M$ and $L$ is a splitting field over $K$. If $M_0$ is a second such field, then there exists an isomorphism of $M$ onto $M_0$ which is the identity on $L$. If $L$ is separable then $M$ is normal over $K$.



We shall call a field having the properties of $M$ a split closure of $L$ over $K$. If $L$ is separable we call $M$ normale closure.



Then problem is that the professor in class did not do man examples, so could you please give me some example of split/normal closure, emphasize their difference and the idea behind the introduction of this concept.



Thank you!






field-theory galois-theory







share|cite|improve this question
























  • What is a secondsuc field?
    – Kenny Lau
    yesterday






  • 1




    The usual terminology is normal closure. Assume that $L = K(alpha)$. Then $M = K(alpha_1,ldots,alpha_n) = prod_{j=1}^n K(alpha_j)$ (compositum of fields) where $alpha_1,ldots,alpha_n$ are the roots of the minimal polynomial $f in K[x]$ of $alpha$ so $K(alpha_j) cong K(alpha)$.
    – reuns
    yesterday












  • In general $L$ doesn't have to be generated by a single element but you can use induction : that if $prod_{j=1}^n F_j$ is normal over $K$ and $F_j cong F_1$ then the normal closure of $prod_{j=1}^n F_j(beta)$ is $prod_{j=1}^n prod_{l=1}^m F_j(beta_{j,l})$ where $beta_{j,l}$ are the roots of $sigma_j(h) in F_j[x]$ and $h in F_1[x]$ is the minimal polynomial of $beta$ and $sigma_j$ is the given isomorphism $F_1 to F_j$.
    – reuns
    yesterday












  • The claim is a bit strange. If the field $K$ is infinite and $L/K$ is not Galois, then $[M:L]>1$ and hence $M$ cannot be written as a finite union of proper subspaces over $K$ let alone subfields. In other words the claim is false in that case. On the other hand, if $K$ is finite, then $L/K$ is Galois, and hence equal to its normal closure, making the claim trivial.
    – Jyrki Lahtonen
    19 hours ago
















1












1








1







I am studing Galois Theory. I am using the books by Kaplansky, Fields and Rings. I am stuck doing this exercise:



Let $M$ be a split closure of $L$ over $K$ ($M,L,K$ are all fields). Prove that $M=L_1cup dots cup L_r$ where $L_i$ is isomorphic to $L$ over $K$.



The actuall problem is that I do not have fully understood the concept of split closure; in the book it is defined in this way.



Let $K subset L$ be fields and $[L:K]$ finite.There exists a field $M$ containing $L$ such that $M$ is a splitting field over $K$ and no field othen than $M$ between $M$ and $L$ is a splitting field over $K$. If $M_0$ is a second such field, then there exists an isomorphism of $M$ onto $M_0$ which is the identity on $L$. If $L$ is separable then $M$ is normal over $K$.



We shall call a field having the properties of $M$ a split closure of $L$ over $K$. If $L$ is separable we call $M$ normale closure.



Then problem is that the professor in class did not do man examples, so could you please give me some example of split/normal closure, emphasize their difference and the idea behind the introduction of this concept.



Thank you!






field-theory galois-theory







share|cite|improve this question















I am studing Galois Theory. I am using the books by Kaplansky, Fields and Rings. I am stuck doing this exercise:



Let $M$ be a split closure of $L$ over $K$ ($M,L,K$ are all fields). Prove that $M=L_1cup dots cup L_r$ where $L_i$ is isomorphic to $L$ over $K$.



The actuall problem is that I do not have fully understood the concept of split closure; in the book it is defined in this way.



Let $K subset L$ be fields and $[L:K]$ finite.There exists a field $M$ containing $L$ such that $M$ is a splitting field over $K$ and no field othen than $M$ between $M$ and $L$ is a splitting field over $K$. If $M_0$ is a second such field, then there exists an isomorphism of $M$ onto $M_0$ which is the identity on $L$. If $L$ is separable then $M$ is normal over $K$.



We shall call a field having the properties of $M$ a split closure of $L$ over $K$. If $L$ is separable we call $M$ normale closure.



Then problem is that the professor in class did not do man examples, so could you please give me some example of split/normal closure, emphasize their difference and the idea behind the introduction of this concept.



Thank you!






field-theory galois-theory




field-theory galois-theory






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




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edited 19 hours ago









Jyrki Lahtonen

108k12166367




108k12166367










asked yesterday









Alessandro Pecile

685




685












  • What is a secondsuc field?
    – Kenny Lau
    yesterday






  • 1




    The usual terminology is normal closure. Assume that $L = K(alpha)$. Then $M = K(alpha_1,ldots,alpha_n) = prod_{j=1}^n K(alpha_j)$ (compositum of fields) where $alpha_1,ldots,alpha_n$ are the roots of the minimal polynomial $f in K[x]$ of $alpha$ so $K(alpha_j) cong K(alpha)$.
    – reuns
    yesterday












  • In general $L$ doesn't have to be generated by a single element but you can use induction : that if $prod_{j=1}^n F_j$ is normal over $K$ and $F_j cong F_1$ then the normal closure of $prod_{j=1}^n F_j(beta)$ is $prod_{j=1}^n prod_{l=1}^m F_j(beta_{j,l})$ where $beta_{j,l}$ are the roots of $sigma_j(h) in F_j[x]$ and $h in F_1[x]$ is the minimal polynomial of $beta$ and $sigma_j$ is the given isomorphism $F_1 to F_j$.
    – reuns
    yesterday












  • The claim is a bit strange. If the field $K$ is infinite and $L/K$ is not Galois, then $[M:L]>1$ and hence $M$ cannot be written as a finite union of proper subspaces over $K$ let alone subfields. In other words the claim is false in that case. On the other hand, if $K$ is finite, then $L/K$ is Galois, and hence equal to its normal closure, making the claim trivial.
    – Jyrki Lahtonen
    19 hours ago




















  • What is a secondsuc field?
    – Kenny Lau
    yesterday






  • 1




    The usual terminology is normal closure. Assume that $L = K(alpha)$. Then $M = K(alpha_1,ldots,alpha_n) = prod_{j=1}^n K(alpha_j)$ (compositum of fields) where $alpha_1,ldots,alpha_n$ are the roots of the minimal polynomial $f in K[x]$ of $alpha$ so $K(alpha_j) cong K(alpha)$.
    – reuns
    yesterday












  • In general $L$ doesn't have to be generated by a single element but you can use induction : that if $prod_{j=1}^n F_j$ is normal over $K$ and $F_j cong F_1$ then the normal closure of $prod_{j=1}^n F_j(beta)$ is $prod_{j=1}^n prod_{l=1}^m F_j(beta_{j,l})$ where $beta_{j,l}$ are the roots of $sigma_j(h) in F_j[x]$ and $h in F_1[x]$ is the minimal polynomial of $beta$ and $sigma_j$ is the given isomorphism $F_1 to F_j$.
    – reuns
    yesterday












  • The claim is a bit strange. If the field $K$ is infinite and $L/K$ is not Galois, then $[M:L]>1$ and hence $M$ cannot be written as a finite union of proper subspaces over $K$ let alone subfields. In other words the claim is false in that case. On the other hand, if $K$ is finite, then $L/K$ is Galois, and hence equal to its normal closure, making the claim trivial.
    – Jyrki Lahtonen
    19 hours ago


















What is a secondsuc field?
– Kenny Lau
yesterday




What is a secondsuc field?
– Kenny Lau
yesterday




1




1




The usual terminology is normal closure. Assume that $L = K(alpha)$. Then $M = K(alpha_1,ldots,alpha_n) = prod_{j=1}^n K(alpha_j)$ (compositum of fields) where $alpha_1,ldots,alpha_n$ are the roots of the minimal polynomial $f in K[x]$ of $alpha$ so $K(alpha_j) cong K(alpha)$.
– reuns
yesterday






The usual terminology is normal closure. Assume that $L = K(alpha)$. Then $M = K(alpha_1,ldots,alpha_n) = prod_{j=1}^n K(alpha_j)$ (compositum of fields) where $alpha_1,ldots,alpha_n$ are the roots of the minimal polynomial $f in K[x]$ of $alpha$ so $K(alpha_j) cong K(alpha)$.
– reuns
yesterday














In general $L$ doesn't have to be generated by a single element but you can use induction : that if $prod_{j=1}^n F_j$ is normal over $K$ and $F_j cong F_1$ then the normal closure of $prod_{j=1}^n F_j(beta)$ is $prod_{j=1}^n prod_{l=1}^m F_j(beta_{j,l})$ where $beta_{j,l}$ are the roots of $sigma_j(h) in F_j[x]$ and $h in F_1[x]$ is the minimal polynomial of $beta$ and $sigma_j$ is the given isomorphism $F_1 to F_j$.
– reuns
yesterday






In general $L$ doesn't have to be generated by a single element but you can use induction : that if $prod_{j=1}^n F_j$ is normal over $K$ and $F_j cong F_1$ then the normal closure of $prod_{j=1}^n F_j(beta)$ is $prod_{j=1}^n prod_{l=1}^m F_j(beta_{j,l})$ where $beta_{j,l}$ are the roots of $sigma_j(h) in F_j[x]$ and $h in F_1[x]$ is the minimal polynomial of $beta$ and $sigma_j$ is the given isomorphism $F_1 to F_j$.
– reuns
yesterday














The claim is a bit strange. If the field $K$ is infinite and $L/K$ is not Galois, then $[M:L]>1$ and hence $M$ cannot be written as a finite union of proper subspaces over $K$ let alone subfields. In other words the claim is false in that case. On the other hand, if $K$ is finite, then $L/K$ is Galois, and hence equal to its normal closure, making the claim trivial.
– Jyrki Lahtonen
19 hours ago






The claim is a bit strange. If the field $K$ is infinite and $L/K$ is not Galois, then $[M:L]>1$ and hence $M$ cannot be written as a finite union of proper subspaces over $K$ let alone subfields. In other words the claim is false in that case. On the other hand, if $K$ is finite, then $L/K$ is Galois, and hence equal to its normal closure, making the claim trivial.
– Jyrki Lahtonen
19 hours ago












1 Answer
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First, I don't think that the union will be finite if the extension is not finite, it will be understood in the following arguments. So I will suppose that $L/K$ is a finite field extension.



Intuitively. As $L/K$ is a finite field extension, we have that $L=K(alpha_1,ldots,alpha_n)$, in such a way that we have a tower of field
$$Lsupset K(alpha_1,ldots,alpha_{n-1})supsetcdotssupset K$$
with non-trivial steps. Let be $f(x)$ the product of the minimal polynomials associated to each step in the previous tower of fields. We have that $L$ is the splitting field of $f(x)$. Construct any tower of fields (the details are a gift for you) this way, using the minimal polynomials (ordered) in the preceding tower of fields and you will get a field isomorphic to $L$. The union, is $K$ attached to all the roots of $f(x)$, so is $M$.



Anyways, you can do the same, using the $mbox{Aut}left(M/Kright)$ and the elements of that group acting on $L$ will give you a family of intermediate fields that are isomorphic to $L$ (including $L$), and thinking in the previous idea, you will get that its union is all $M$.






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    First, I don't think that the union will be finite if the extension is not finite, it will be understood in the following arguments. So I will suppose that $L/K$ is a finite field extension.



    Intuitively. As $L/K$ is a finite field extension, we have that $L=K(alpha_1,ldots,alpha_n)$, in such a way that we have a tower of field
    $$Lsupset K(alpha_1,ldots,alpha_{n-1})supsetcdotssupset K$$
    with non-trivial steps. Let be $f(x)$ the product of the minimal polynomials associated to each step in the previous tower of fields. We have that $L$ is the splitting field of $f(x)$. Construct any tower of fields (the details are a gift for you) this way, using the minimal polynomials (ordered) in the preceding tower of fields and you will get a field isomorphic to $L$. The union, is $K$ attached to all the roots of $f(x)$, so is $M$.



    Anyways, you can do the same, using the $mbox{Aut}left(M/Kright)$ and the elements of that group acting on $L$ will give you a family of intermediate fields that are isomorphic to $L$ (including $L$), and thinking in the previous idea, you will get that its union is all $M$.






    share|cite|improve this answer


























      0














      First, I don't think that the union will be finite if the extension is not finite, it will be understood in the following arguments. So I will suppose that $L/K$ is a finite field extension.



      Intuitively. As $L/K$ is a finite field extension, we have that $L=K(alpha_1,ldots,alpha_n)$, in such a way that we have a tower of field
      $$Lsupset K(alpha_1,ldots,alpha_{n-1})supsetcdotssupset K$$
      with non-trivial steps. Let be $f(x)$ the product of the minimal polynomials associated to each step in the previous tower of fields. We have that $L$ is the splitting field of $f(x)$. Construct any tower of fields (the details are a gift for you) this way, using the minimal polynomials (ordered) in the preceding tower of fields and you will get a field isomorphic to $L$. The union, is $K$ attached to all the roots of $f(x)$, so is $M$.



      Anyways, you can do the same, using the $mbox{Aut}left(M/Kright)$ and the elements of that group acting on $L$ will give you a family of intermediate fields that are isomorphic to $L$ (including $L$), and thinking in the previous idea, you will get that its union is all $M$.






      share|cite|improve this answer
























        0












        0








        0






        First, I don't think that the union will be finite if the extension is not finite, it will be understood in the following arguments. So I will suppose that $L/K$ is a finite field extension.



        Intuitively. As $L/K$ is a finite field extension, we have that $L=K(alpha_1,ldots,alpha_n)$, in such a way that we have a tower of field
        $$Lsupset K(alpha_1,ldots,alpha_{n-1})supsetcdotssupset K$$
        with non-trivial steps. Let be $f(x)$ the product of the minimal polynomials associated to each step in the previous tower of fields. We have that $L$ is the splitting field of $f(x)$. Construct any tower of fields (the details are a gift for you) this way, using the minimal polynomials (ordered) in the preceding tower of fields and you will get a field isomorphic to $L$. The union, is $K$ attached to all the roots of $f(x)$, so is $M$.



        Anyways, you can do the same, using the $mbox{Aut}left(M/Kright)$ and the elements of that group acting on $L$ will give you a family of intermediate fields that are isomorphic to $L$ (including $L$), and thinking in the previous idea, you will get that its union is all $M$.






        share|cite|improve this answer












        First, I don't think that the union will be finite if the extension is not finite, it will be understood in the following arguments. So I will suppose that $L/K$ is a finite field extension.



        Intuitively. As $L/K$ is a finite field extension, we have that $L=K(alpha_1,ldots,alpha_n)$, in such a way that we have a tower of field
        $$Lsupset K(alpha_1,ldots,alpha_{n-1})supsetcdotssupset K$$
        with non-trivial steps. Let be $f(x)$ the product of the minimal polynomials associated to each step in the previous tower of fields. We have that $L$ is the splitting field of $f(x)$. Construct any tower of fields (the details are a gift for you) this way, using the minimal polynomials (ordered) in the preceding tower of fields and you will get a field isomorphic to $L$. The union, is $K$ attached to all the roots of $f(x)$, so is $M$.



        Anyways, you can do the same, using the $mbox{Aut}left(M/Kright)$ and the elements of that group acting on $L$ will give you a family of intermediate fields that are isomorphic to $L$ (including $L$), and thinking in the previous idea, you will get that its union is all $M$.







        share|cite|improve this answer












        share|cite|improve this answer



        share|cite|improve this answer










        answered yesterday









        José Alejandro Aburto Araneda

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