Answer: Find Order of A, J, N and Subgroup of Each Possible Order

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In summary: The identity is A.b) The inverse of each element is:A - AB - KC - JD - NF - HG - BH - FJ - AK - GL - NM - CN - Dc) The order of A is 1, the order of J is 2, and the order of N is 2.d) The elements that are rotations are:A, B, C, D, F, G, H, K, L, MThe elements that are reflections are:J, NThis is because rotations have order 1 or 2, while reflections have order 2
  • #1
vj9
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I have a problem a group consists of following element A,B,C,D,F,G,H,J,K,L,M,N.How can we find the order of elements A,J,N?

state the possible orders of the proper subgroups?

Here is the group table

... A B C D F G H J K L M N

A . C G J M B K A D N F H L
B . F H L K A M B N D C G J
C . J K D H G N C M L B A F
D. M L H C N F D A B K J G
F . L M N G H D F K J A B C
G . B A F N C H G L M J K D
H . A B C D F G H J K L M N
K . G C B L J A K F H D N M
L . N D K B M J L G C H F A
M . H F A J L B M C G N D K
N . K J G F D C N B A M L HFind a subgroup of each possible order

Can anyone please help me out with this problem?
 
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  • #2
Can we also find the order the group?
 
  • #3
I put the table in a code block to make to make it easier to read. This makes it easier to spot which element is the identity element.
vj9 said:
I have a problem a group consists of following element A,B,C,D,F,G,H,J,K,L,M,N.


How can we find the order of elements A,J,N?
For this part, you want to find n such that An = e, the identity element. Do the same for J and N.
vj9 said:
state the possible orders of the proper subgroups?

Here is the group table
Code:
  . [B] A B C D F G H J K L M N[/B]
[B]A[/B] .  C G J M B K A D N F H L
[B]B[/B] .  F H L K A M B N D C G J
[B]C[/B] .  J K D H G N C M L B A F
[B]D[/B].   M L H C N F D A B K J G
[B]F[/B] .  L M N G H D F K J A B C
[B]G[/B] .  B A F N C H G L M J K D
[B]H[/B] .  A B C D F G H J K L M N
[B]K[/B] .  G C B L J A K F H D N M
[B]L[/B] .  N D K B M J L G C H F A
[B]M[/B] .  H F A J L B M C G N D K
[B]N[/B] .  K J G F D C N B A M L H

Find a subgroup of each possible order

Can anyone please help me out with this problem?
 
  • #4
Thanks Mark,

I think the order for J and N is 2. I still have problems with A and what is the order of the whole table?
 
  • #5
I didn't notice it before, but the table is missing a row for J, so I don't know how you can tell that the order of J is 2. There are a bunch of elements whose order is 2. One of these is N.

I don't think it makes sense to talk about the order of the whole table, but it probably makes sense to talk about the order of the group. How is this term defined?
 
  • #6
The elements of J are

D N M A K L J H F G C B

Yes it is the order of thr group. I have typed it wrong. In the question it is also asking for the rotations and reflections. The group table is for the symmetrices of a rectangular hexagon ( clockwise rotations of 60, 120, 180,,240 and 300, reflections in the mid points of opposite sides in the lines through opposite vertices but not in this order)

a) Find the identity,
b) inverse of each element,
c) order of A, J, N,
d) State with reasons, which of the elements are reflections and which are rotations.
e) state the possible orders of the proper group

This is my question.
 
  • #7
Here's the table with the missing row back in.
Code:
  . [B] A B C D F G H J K L M N[/B]
[B]A[/B] .  C G J M B K A D N F H L
[B]B[/B] .  F H L K A M B N D C G J
[B]C[/B] .  J K D H G N C M L B A F
[B]D[/B].   M L H C N F D A B K J G
[B]F[/B] .  L M N G H D F K J A B C
[B]G[/B] .  B A F N C H G L M J K D
[B]H[/B] .  A B C D F G H J K L M N
[b]J[/b] .  D N M A K L J H F G C B
[B]K[/B] .  G C B L J A K F H D N M
[B]L[/B] .  N D K B M J L G C H F A
[B]M[/B] .  H F A J L B M C G N D K
[B]N[/B] .  K J G F D C N B A M L H
vj9 said:
Yes it is the order of thr group. I have typed it wrong. In the question it is also asking for the rotations and reflections. The group table is for the symmetrices of a rectangular hexagon ( clockwise rotations of 60, 120, 180,,240 and 300, reflections in the mid points of opposite sides in the lines through opposite vertices but not in this order)

a) Find the identity,
b) inverse of each element,
c) order of A, J, N,
d) State with reasons, which of the elements are reflections and which are rotations.
e) state the possible orders of the proper group
a) You already know the identity.
b) Go through the table and find the inverse of each element. E.g. A ? = E, where E represents the identity.
c) Do what I said in post 3.
d) All the reflections are order 2. If you reflect something twice, you get back to the same thing you started with. The rotations are of order 2, 3, 5, and 6. Note that a rotation of 180 degrees is the same as a reflection, so I don't think there's a way to tell the difference between a relection and a rotation by this amount. For the rotations, think about how many times you have to do a certain rotation to get back to where you started.
e) You're going to have subgroups of order 2, 3, 5, and 6. I don't remember the definition for the order of a group, but it might be the highest order of any element in the group. Check this, though - you want to be using the correct definition.
 
  • #8
Thank You very much matt. Your answers are very helpful
 
  • #9
Sorry typo. Thanks Mark
 
  • #10
Hi Mark,

I am trying to figure out the relections and rotations. I am stuck on it. Any help please? I am unable to do it.

Thanks in advance.
 
  • #12
For the above table, for the subgroup of order 3, find its left cosets and right cosets?

b)For the subgroup of index 3, find its left cosets and right cosets?
 
  • #13
vj9 said:
For the above table, for the subgroup of order 3, find its left cosets and right cosets?

b)For the subgroup of index 3, find its left cosets and right cosets?
What is the subgroup of order 3? What are the definitions of left and right cosets? What's the difference between a subgroup of order 3 and a subgroup of index 3?
 
  • #14
Hi Mark,

Thank for your help. I have sorted out the cosets. Can you help me on my statistics work. Here is the scenario. " I Just need to know which statistical method to use to carry out the data

The scenario is as follows

Since the 1960s there has been an ongoing campaign among Quebecois to separate from Canada and form an independent nation. Should Quebec separate, the ramifications for the rest of Canada, American States that border Quebec, the North American Free Trade Agreement and numerous multi-national corporations would be enormous. In the 1993 elections the pro-sovereigntist Bloc Quebecois won 54 of Quebec’s 75 seats in the House of Commons. In 1994 the separatist Parti Quebecois formed the provincial government in Quebec and promised to hold a referendum on separation. As with most political issues, polling plays an important role in trying to influence voters and to predict the outcome of the referendum vote. Shortly after the 1993 federal election, The Financial Magazine, in co-operation with several polling companies, conducted a survey of Quebecois.

A total of 641 adult Quebecois were interviewed. They were asked the following question. (Francophones were asked the question in French). The pollsters also recorded the language (English or French) in which the respondent answered.

If a referendum were held today on Quebec’s sovereignty with the following question, “Do you want Quebec to separate from Canada and become an independent country?” would you vote yes or no?

2 Yes
1 No

The responses were recorded and stored in columns 1 (planned referendum vote for Francophones) and 2(planned referendum vote for Anglophones)

Infer from the data:

a) If the referendum were held on the day of the survey, would Quebec vote to remain in Canada?

b) Estimate with 95% confidence the difference between French and English speaking Quebecers in their support for separation.
 

FAQ: Answer: Find Order of A, J, N and Subgroup of Each Possible Order

What is the purpose of finding the order of A, J, N and their subgroups?

Answer: The order of a group or subgroup is the number of elements in that group or subgroup. It is an important concept in group theory and helps us understand the structure and complexity of a group. Finding the order of A, J, N and their subgroups can provide valuable insights into their properties and relationships.

How do you find the order of a group or subgroup?

Answer: The order of a group or subgroup can be found by counting the number of elements in that group or subgroup. For example, if a subgroup has 5 elements, its order is 5. In some cases, the order can also be determined by using certain mathematical formulas or algorithms.

What is the significance of the order of a subgroup in relation to the order of the original group?

Answer: The order of a subgroup is always a factor or divisor of the order of the original group. This means that the order of a subgroup gives us information about the possible orders of other subgroups within the original group. It also helps us understand the structure and hierarchy of a group.

Can a subgroup have the same order as the original group?

Answer: Yes, it is possible for a subgroup to have the same order as the original group. This is known as a maximal subgroup and it is an important concept in group theory. In this case, the subgroup is not considered a proper subgroup, as it contains all the elements of the original group.

How does the order of a subgroup affect the complexity of a group?

Answer: The order of a subgroup can give us insights into the complexity of a group. A subgroup with a smaller order may indicate a simpler and more regular structure, while a subgroup with a larger order may indicate a more complex and irregular structure. This can be useful in understanding the behavior and properties of a group in various contexts.

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