Counting Formula Clarification (Groups/Cosets)

In summary, [G:H] refers to the number of cosets in a group G divided by a subgroup H. This is known as the Counting Formula. It is also clarified that [G:H] only represents the number of left cosets, which is equivalent to the number of right cosets.
  • #1
EV33
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Homework Statement




G is a group. H is a subgroup.
lHl= order of H
lGl=order of G
[G:H]=Number of cosets

Counting Formula
lGl = lHl [G:H]


I have a question of clarification about this formula. My book says that [G:H]=number of cosets.

The problem is that at this point in my book they haven't defined right cosests yet so I wasn't sure if
[G:H]= The sum of the rights cosests and left cosets?

or

[G:H]= Just the left cosets?


Thank you.
 
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  • #2
Just the number of left cosets which is equal to the number of right cosets.
 
  • #3
Thank you, HallsofIvy.
 

Related to Counting Formula Clarification (Groups/Cosets)

1. What is the counting formula clarification for groups/cosets?

The counting formula clarification for groups/cosets is a mathematical tool used to determine the number of distinct elements in a group or coset. It takes into account the size of the group and the number of distinct cosets.

2. How is the counting formula clarification different from the traditional counting formula?

The traditional counting formula only takes into account the size of the group, while the counting formula clarification also considers the number of distinct cosets. This provides a more accurate count of the elements in a group.

3. Why is the counting formula clarification important in group theory?

The counting formula clarification is important in group theory because it allows for the calculation of the number of elements in a group or coset, which is essential in understanding the structure and properties of groups. It also helps in solving problems related to groups, such as finding the order of a group or determining the number of subgroups.

4. Can the counting formula clarification be applied to all types of groups?

Yes, the counting formula clarification can be applied to any type of group, whether finite or infinite, cyclic or non-cyclic. It is a universal tool in group theory.

5. How is the counting formula clarification used in practical applications?

The counting formula clarification is used in various practical applications, such as cryptography, coding theory, and combinatorics. It allows for the efficient calculation of the number of possible combinations and permutations, which is useful in many fields, including computer science, engineering, and statistics.

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