Prove that a group with $3$ elements is cyclic?












1















Prove that a group with $3$ elements is cyclic.




I tried the case where $G={e,a,b}
$

and I kept trying multiplication
and finally I found that
$a^2$ must equal to $b$ and $b^2$ must equal to $a$.
Then $a^3=e$.



Are there any other methods
?
I have another question :




Prove that a group with $4$ elements may or may not be cyclic.











share|cite|improve this question
























  • Another method is to use the Lagrange's Theorem. Using Lagrange Theorem, you can prove that any group of prime order is cyclic.
    – Thomas Shelby
    2 days ago










  • I think that it doesn't take a lot of work to prove that any group of order $4$ (note that I omitted the word “finite”; are you aware of some infinite group of order $4$?) may by cyclic or not.
    – José Carlos Santos
    2 days ago












  • I recommend to read my answer here math.stackexchange.com/questions/1570641/…. A similar method works for a group of 4 elements.
    – Nicky Hekster
    2 days ago






  • 1




    @ThomasShelby: you mean Cauchy's theorem, right? Lagrange's theorem only gives $o(g)mid o(G)$, while Cauchy's theorem ensures $o(G)=pLongrightarrowexists g:o(g)=p$.
    – Jack D'Aurizio
    2 days ago






  • 1




    @ThomasShelby: all right, I get it. Since the identity is unique and $o(g)mid o(G)$, in a group with prime order all the elements except the identity are generators, fine.
    – Jack D'Aurizio
    2 days ago
















1















Prove that a group with $3$ elements is cyclic.




I tried the case where $G={e,a,b}
$

and I kept trying multiplication
and finally I found that
$a^2$ must equal to $b$ and $b^2$ must equal to $a$.
Then $a^3=e$.



Are there any other methods
?
I have another question :




Prove that a group with $4$ elements may or may not be cyclic.











share|cite|improve this question
























  • Another method is to use the Lagrange's Theorem. Using Lagrange Theorem, you can prove that any group of prime order is cyclic.
    – Thomas Shelby
    2 days ago










  • I think that it doesn't take a lot of work to prove that any group of order $4$ (note that I omitted the word “finite”; are you aware of some infinite group of order $4$?) may by cyclic or not.
    – José Carlos Santos
    2 days ago












  • I recommend to read my answer here math.stackexchange.com/questions/1570641/…. A similar method works for a group of 4 elements.
    – Nicky Hekster
    2 days ago






  • 1




    @ThomasShelby: you mean Cauchy's theorem, right? Lagrange's theorem only gives $o(g)mid o(G)$, while Cauchy's theorem ensures $o(G)=pLongrightarrowexists g:o(g)=p$.
    – Jack D'Aurizio
    2 days ago






  • 1




    @ThomasShelby: all right, I get it. Since the identity is unique and $o(g)mid o(G)$, in a group with prime order all the elements except the identity are generators, fine.
    – Jack D'Aurizio
    2 days ago














1












1








1








Prove that a group with $3$ elements is cyclic.




I tried the case where $G={e,a,b}
$

and I kept trying multiplication
and finally I found that
$a^2$ must equal to $b$ and $b^2$ must equal to $a$.
Then $a^3=e$.



Are there any other methods
?
I have another question :




Prove that a group with $4$ elements may or may not be cyclic.











share|cite|improve this question
















Prove that a group with $3$ elements is cyclic.




I tried the case where $G={e,a,b}
$

and I kept trying multiplication
and finally I found that
$a^2$ must equal to $b$ and $b^2$ must equal to $a$.
Then $a^3=e$.



Are there any other methods
?
I have another question :




Prove that a group with $4$ elements may or may not be cyclic.








group-theory cyclic-groups






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited 2 days ago









Thomas Shelby

1,820217




1,820217










asked 2 days ago









El Mouden

1039




1039












  • Another method is to use the Lagrange's Theorem. Using Lagrange Theorem, you can prove that any group of prime order is cyclic.
    – Thomas Shelby
    2 days ago










  • I think that it doesn't take a lot of work to prove that any group of order $4$ (note that I omitted the word “finite”; are you aware of some infinite group of order $4$?) may by cyclic or not.
    – José Carlos Santos
    2 days ago












  • I recommend to read my answer here math.stackexchange.com/questions/1570641/…. A similar method works for a group of 4 elements.
    – Nicky Hekster
    2 days ago






  • 1




    @ThomasShelby: you mean Cauchy's theorem, right? Lagrange's theorem only gives $o(g)mid o(G)$, while Cauchy's theorem ensures $o(G)=pLongrightarrowexists g:o(g)=p$.
    – Jack D'Aurizio
    2 days ago






  • 1




    @ThomasShelby: all right, I get it. Since the identity is unique and $o(g)mid o(G)$, in a group with prime order all the elements except the identity are generators, fine.
    – Jack D'Aurizio
    2 days ago


















  • Another method is to use the Lagrange's Theorem. Using Lagrange Theorem, you can prove that any group of prime order is cyclic.
    – Thomas Shelby
    2 days ago










  • I think that it doesn't take a lot of work to prove that any group of order $4$ (note that I omitted the word “finite”; are you aware of some infinite group of order $4$?) may by cyclic or not.
    – José Carlos Santos
    2 days ago












  • I recommend to read my answer here math.stackexchange.com/questions/1570641/…. A similar method works for a group of 4 elements.
    – Nicky Hekster
    2 days ago






  • 1




    @ThomasShelby: you mean Cauchy's theorem, right? Lagrange's theorem only gives $o(g)mid o(G)$, while Cauchy's theorem ensures $o(G)=pLongrightarrowexists g:o(g)=p$.
    – Jack D'Aurizio
    2 days ago






  • 1




    @ThomasShelby: all right, I get it. Since the identity is unique and $o(g)mid o(G)$, in a group with prime order all the elements except the identity are generators, fine.
    – Jack D'Aurizio
    2 days ago
















Another method is to use the Lagrange's Theorem. Using Lagrange Theorem, you can prove that any group of prime order is cyclic.
– Thomas Shelby
2 days ago




Another method is to use the Lagrange's Theorem. Using Lagrange Theorem, you can prove that any group of prime order is cyclic.
– Thomas Shelby
2 days ago












I think that it doesn't take a lot of work to prove that any group of order $4$ (note that I omitted the word “finite”; are you aware of some infinite group of order $4$?) may by cyclic or not.
– José Carlos Santos
2 days ago






I think that it doesn't take a lot of work to prove that any group of order $4$ (note that I omitted the word “finite”; are you aware of some infinite group of order $4$?) may by cyclic or not.
– José Carlos Santos
2 days ago














I recommend to read my answer here math.stackexchange.com/questions/1570641/…. A similar method works for a group of 4 elements.
– Nicky Hekster
2 days ago




I recommend to read my answer here math.stackexchange.com/questions/1570641/…. A similar method works for a group of 4 elements.
– Nicky Hekster
2 days ago




1




1




@ThomasShelby: you mean Cauchy's theorem, right? Lagrange's theorem only gives $o(g)mid o(G)$, while Cauchy's theorem ensures $o(G)=pLongrightarrowexists g:o(g)=p$.
– Jack D'Aurizio
2 days ago




@ThomasShelby: you mean Cauchy's theorem, right? Lagrange's theorem only gives $o(g)mid o(G)$, while Cauchy's theorem ensures $o(G)=pLongrightarrowexists g:o(g)=p$.
– Jack D'Aurizio
2 days ago




1




1




@ThomasShelby: all right, I get it. Since the identity is unique and $o(g)mid o(G)$, in a group with prime order all the elements except the identity are generators, fine.
– Jack D'Aurizio
2 days ago




@ThomasShelby: all right, I get it. Since the identity is unique and $o(g)mid o(G)$, in a group with prime order all the elements except the identity are generators, fine.
– Jack D'Aurizio
2 days ago










2 Answers
2






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oldest

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3














Instead of “keeping multiplying” it's easier to fill the Cayley diagram: in every row and column every element must appear.



begin{array}{c|ccc}
& e & a & b \ hline
e & e & a & b \
a & a & \
b & b & \
end{array}

In the slot corresponding to $a^2$ you cannot put $e$, because otherwise the slot for $ab$ would contain $b$. Hence $a^2=b$
begin{array}{c|ccc}
& e & a & b \ hline
e & e & a & b \
a & a & b\
b & b & \
end{array}

and now the diagram has a unique completion
begin{array}{c|ccc}
& e & a & b \ hline
e & e & a & b \
a & a & b & e \
b & b & e & a\
end{array}

Then $a^3=a^2a=ba=e$.



You can try your hand with a four element group and see that the diagram admits different completions.



begin{array}{c|cccc}
& e & a & b & c \ hline
e & e & a & b & c \
a & a & \
b & b & \
c & c &
end{array}

In the slot for $a^2$ we can put any of $e$, $b$ or $c$. Let's try with $e$:
begin{array}{c|cccc}
& e & a & b & c \ hline
e & e & a & b & c \
a & a & e\
b & b & \
c & c &
end{array}

Then we are forced to put in the following
begin{array}{c|cccc}
& e & a & b & c \ hline
e & e & a & b & c \
a & a & e & c & b \
b & b & c\
c & c & b
end{array}

For $b^2$ we can have either $e$ or $c$. Let's try $e$:
begin{array}{c|cccc}
& e & a & b & c \ hline
e & e & a & b & c \
a & a & e & c & b \
b & b & c & e\
c & c & b &
end{array}

Now we can complete:
begin{array}{c|cccc}
& e & a & b & c \ hline
e & e & a & b & c \
a & a & e & c & b \
b & b & c & e & a\
c & c & b & a & e
end{array}

It would be very tedious to verify that this diagram indeed produces a group. It does and is the product of two cyclic groups of order two; it is also the subgroup of $S_4$ given by ${id,(12)(34),(13)(24),(14)(23)}$.






share|cite|improve this answer































    0














    According to Lagrange's theorem, a group with 3 elements can have only the trivial subgroups. Because 3 is prime only 1 and 3 divide it. So, only possible subgroups are ${e}$ with one element and $G$ with three. For $x in G$ that is not $e$ a group generated with this element,
    $<x>$ must be whole $G$. So $G$ is cyclic.



    A group with 4 elements can have untrivial subgroups as 4 isn't prime. For instance $mathbb{Z_4} = {0, 1, 2, 3}$ with $+$ is cyclic. It is generated with the element $1$. But group $mathbb{Z_2} times mathbb{Z_2} = {(0, 0), (1, 0), (0, 1), (1, 1)}$ with $+$ defined as $(a, b) + (a', b') = (a + a', b + b')$ is not cyclic.






    share|cite|improve this answer





















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      2 Answers
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      active

      oldest

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      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      3














      Instead of “keeping multiplying” it's easier to fill the Cayley diagram: in every row and column every element must appear.



      begin{array}{c|ccc}
      & e & a & b \ hline
      e & e & a & b \
      a & a & \
      b & b & \
      end{array}

      In the slot corresponding to $a^2$ you cannot put $e$, because otherwise the slot for $ab$ would contain $b$. Hence $a^2=b$
      begin{array}{c|ccc}
      & e & a & b \ hline
      e & e & a & b \
      a & a & b\
      b & b & \
      end{array}

      and now the diagram has a unique completion
      begin{array}{c|ccc}
      & e & a & b \ hline
      e & e & a & b \
      a & a & b & e \
      b & b & e & a\
      end{array}

      Then $a^3=a^2a=ba=e$.



      You can try your hand with a four element group and see that the diagram admits different completions.



      begin{array}{c|cccc}
      & e & a & b & c \ hline
      e & e & a & b & c \
      a & a & \
      b & b & \
      c & c &
      end{array}

      In the slot for $a^2$ we can put any of $e$, $b$ or $c$. Let's try with $e$:
      begin{array}{c|cccc}
      & e & a & b & c \ hline
      e & e & a & b & c \
      a & a & e\
      b & b & \
      c & c &
      end{array}

      Then we are forced to put in the following
      begin{array}{c|cccc}
      & e & a & b & c \ hline
      e & e & a & b & c \
      a & a & e & c & b \
      b & b & c\
      c & c & b
      end{array}

      For $b^2$ we can have either $e$ or $c$. Let's try $e$:
      begin{array}{c|cccc}
      & e & a & b & c \ hline
      e & e & a & b & c \
      a & a & e & c & b \
      b & b & c & e\
      c & c & b &
      end{array}

      Now we can complete:
      begin{array}{c|cccc}
      & e & a & b & c \ hline
      e & e & a & b & c \
      a & a & e & c & b \
      b & b & c & e & a\
      c & c & b & a & e
      end{array}

      It would be very tedious to verify that this diagram indeed produces a group. It does and is the product of two cyclic groups of order two; it is also the subgroup of $S_4$ given by ${id,(12)(34),(13)(24),(14)(23)}$.






      share|cite|improve this answer




























        3














        Instead of “keeping multiplying” it's easier to fill the Cayley diagram: in every row and column every element must appear.



        begin{array}{c|ccc}
        & e & a & b \ hline
        e & e & a & b \
        a & a & \
        b & b & \
        end{array}

        In the slot corresponding to $a^2$ you cannot put $e$, because otherwise the slot for $ab$ would contain $b$. Hence $a^2=b$
        begin{array}{c|ccc}
        & e & a & b \ hline
        e & e & a & b \
        a & a & b\
        b & b & \
        end{array}

        and now the diagram has a unique completion
        begin{array}{c|ccc}
        & e & a & b \ hline
        e & e & a & b \
        a & a & b & e \
        b & b & e & a\
        end{array}

        Then $a^3=a^2a=ba=e$.



        You can try your hand with a four element group and see that the diagram admits different completions.



        begin{array}{c|cccc}
        & e & a & b & c \ hline
        e & e & a & b & c \
        a & a & \
        b & b & \
        c & c &
        end{array}

        In the slot for $a^2$ we can put any of $e$, $b$ or $c$. Let's try with $e$:
        begin{array}{c|cccc}
        & e & a & b & c \ hline
        e & e & a & b & c \
        a & a & e\
        b & b & \
        c & c &
        end{array}

        Then we are forced to put in the following
        begin{array}{c|cccc}
        & e & a & b & c \ hline
        e & e & a & b & c \
        a & a & e & c & b \
        b & b & c\
        c & c & b
        end{array}

        For $b^2$ we can have either $e$ or $c$. Let's try $e$:
        begin{array}{c|cccc}
        & e & a & b & c \ hline
        e & e & a & b & c \
        a & a & e & c & b \
        b & b & c & e\
        c & c & b &
        end{array}

        Now we can complete:
        begin{array}{c|cccc}
        & e & a & b & c \ hline
        e & e & a & b & c \
        a & a & e & c & b \
        b & b & c & e & a\
        c & c & b & a & e
        end{array}

        It would be very tedious to verify that this diagram indeed produces a group. It does and is the product of two cyclic groups of order two; it is also the subgroup of $S_4$ given by ${id,(12)(34),(13)(24),(14)(23)}$.






        share|cite|improve this answer


























          3












          3








          3






          Instead of “keeping multiplying” it's easier to fill the Cayley diagram: in every row and column every element must appear.



          begin{array}{c|ccc}
          & e & a & b \ hline
          e & e & a & b \
          a & a & \
          b & b & \
          end{array}

          In the slot corresponding to $a^2$ you cannot put $e$, because otherwise the slot for $ab$ would contain $b$. Hence $a^2=b$
          begin{array}{c|ccc}
          & e & a & b \ hline
          e & e & a & b \
          a & a & b\
          b & b & \
          end{array}

          and now the diagram has a unique completion
          begin{array}{c|ccc}
          & e & a & b \ hline
          e & e & a & b \
          a & a & b & e \
          b & b & e & a\
          end{array}

          Then $a^3=a^2a=ba=e$.



          You can try your hand with a four element group and see that the diagram admits different completions.



          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & \
          b & b & \
          c & c &
          end{array}

          In the slot for $a^2$ we can put any of $e$, $b$ or $c$. Let's try with $e$:
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e\
          b & b & \
          c & c &
          end{array}

          Then we are forced to put in the following
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e & c & b \
          b & b & c\
          c & c & b
          end{array}

          For $b^2$ we can have either $e$ or $c$. Let's try $e$:
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e & c & b \
          b & b & c & e\
          c & c & b &
          end{array}

          Now we can complete:
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e & c & b \
          b & b & c & e & a\
          c & c & b & a & e
          end{array}

          It would be very tedious to verify that this diagram indeed produces a group. It does and is the product of two cyclic groups of order two; it is also the subgroup of $S_4$ given by ${id,(12)(34),(13)(24),(14)(23)}$.






          share|cite|improve this answer














          Instead of “keeping multiplying” it's easier to fill the Cayley diagram: in every row and column every element must appear.



          begin{array}{c|ccc}
          & e & a & b \ hline
          e & e & a & b \
          a & a & \
          b & b & \
          end{array}

          In the slot corresponding to $a^2$ you cannot put $e$, because otherwise the slot for $ab$ would contain $b$. Hence $a^2=b$
          begin{array}{c|ccc}
          & e & a & b \ hline
          e & e & a & b \
          a & a & b\
          b & b & \
          end{array}

          and now the diagram has a unique completion
          begin{array}{c|ccc}
          & e & a & b \ hline
          e & e & a & b \
          a & a & b & e \
          b & b & e & a\
          end{array}

          Then $a^3=a^2a=ba=e$.



          You can try your hand with a four element group and see that the diagram admits different completions.



          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & \
          b & b & \
          c & c &
          end{array}

          In the slot for $a^2$ we can put any of $e$, $b$ or $c$. Let's try with $e$:
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e\
          b & b & \
          c & c &
          end{array}

          Then we are forced to put in the following
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e & c & b \
          b & b & c\
          c & c & b
          end{array}

          For $b^2$ we can have either $e$ or $c$. Let's try $e$:
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e & c & b \
          b & b & c & e\
          c & c & b &
          end{array}

          Now we can complete:
          begin{array}{c|cccc}
          & e & a & b & c \ hline
          e & e & a & b & c \
          a & a & e & c & b \
          b & b & c & e & a\
          c & c & b & a & e
          end{array}

          It would be very tedious to verify that this diagram indeed produces a group. It does and is the product of two cyclic groups of order two; it is also the subgroup of $S_4$ given by ${id,(12)(34),(13)(24),(14)(23)}$.







          share|cite|improve this answer














          share|cite|improve this answer



          share|cite|improve this answer








          edited 2 days ago

























          answered 2 days ago









          egreg

          178k1484201




          178k1484201























              0














              According to Lagrange's theorem, a group with 3 elements can have only the trivial subgroups. Because 3 is prime only 1 and 3 divide it. So, only possible subgroups are ${e}$ with one element and $G$ with three. For $x in G$ that is not $e$ a group generated with this element,
              $<x>$ must be whole $G$. So $G$ is cyclic.



              A group with 4 elements can have untrivial subgroups as 4 isn't prime. For instance $mathbb{Z_4} = {0, 1, 2, 3}$ with $+$ is cyclic. It is generated with the element $1$. But group $mathbb{Z_2} times mathbb{Z_2} = {(0, 0), (1, 0), (0, 1), (1, 1)}$ with $+$ defined as $(a, b) + (a', b') = (a + a', b + b')$ is not cyclic.






              share|cite|improve this answer


























                0














                According to Lagrange's theorem, a group with 3 elements can have only the trivial subgroups. Because 3 is prime only 1 and 3 divide it. So, only possible subgroups are ${e}$ with one element and $G$ with three. For $x in G$ that is not $e$ a group generated with this element,
                $<x>$ must be whole $G$. So $G$ is cyclic.



                A group with 4 elements can have untrivial subgroups as 4 isn't prime. For instance $mathbb{Z_4} = {0, 1, 2, 3}$ with $+$ is cyclic. It is generated with the element $1$. But group $mathbb{Z_2} times mathbb{Z_2} = {(0, 0), (1, 0), (0, 1), (1, 1)}$ with $+$ defined as $(a, b) + (a', b') = (a + a', b + b')$ is not cyclic.






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                  According to Lagrange's theorem, a group with 3 elements can have only the trivial subgroups. Because 3 is prime only 1 and 3 divide it. So, only possible subgroups are ${e}$ with one element and $G$ with three. For $x in G$ that is not $e$ a group generated with this element,
                  $<x>$ must be whole $G$. So $G$ is cyclic.



                  A group with 4 elements can have untrivial subgroups as 4 isn't prime. For instance $mathbb{Z_4} = {0, 1, 2, 3}$ with $+$ is cyclic. It is generated with the element $1$. But group $mathbb{Z_2} times mathbb{Z_2} = {(0, 0), (1, 0), (0, 1), (1, 1)}$ with $+$ defined as $(a, b) + (a', b') = (a + a', b + b')$ is not cyclic.






                  share|cite|improve this answer












                  According to Lagrange's theorem, a group with 3 elements can have only the trivial subgroups. Because 3 is prime only 1 and 3 divide it. So, only possible subgroups are ${e}$ with one element and $G$ with three. For $x in G$ that is not $e$ a group generated with this element,
                  $<x>$ must be whole $G$. So $G$ is cyclic.



                  A group with 4 elements can have untrivial subgroups as 4 isn't prime. For instance $mathbb{Z_4} = {0, 1, 2, 3}$ with $+$ is cyclic. It is generated with the element $1$. But group $mathbb{Z_2} times mathbb{Z_2} = {(0, 0), (1, 0), (0, 1), (1, 1)}$ with $+$ defined as $(a, b) + (a', b') = (a + a', b + b')$ is not cyclic.







                  share|cite|improve this answer












                  share|cite|improve this answer



                  share|cite|improve this answer










                  answered 2 days ago









                  Coupeau

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