412.42 - Finding elements in S_3

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Discussion Overview

The discussion revolves around finding elements α and β in the symmetric group $S_3$ such that |α| = 2, |β| = 2, and |αβ| = 3. The scope includes mathematical reasoning and exploration of group theory concepts.

Discussion Character

  • Exploratory, Mathematical reasoning, Homework-related

Main Points Raised

  • Some participants suggest listing all elements of $S_3$ to find suitable pairs of elements with the required properties.
  • It is noted that $S_3$ consists of three transpositions and two 3-cycles, along with the identity element.
  • One participant questions the order of the product of two elements and seeks clarification on the orders of 2-cycles and 3-cycles.
  • Another participant proposes a specific product of elements, $(12)(23)$, and claims it has order 3, prompting further discussion on the correctness of this calculation.
  • There is a request for clarification on the notation and the need to specify the product correctly.

Areas of Agreement / Disagreement

Participants generally agree on the approach of using trial and error with the elements of $S_3$, but there is some uncertainty regarding the specific products and their orders.

Contextual Notes

Some participants express confusion about the properties of the elements and the calculations involved, indicating a need for clearer definitions and understanding of group elements.

Who May Find This Useful

Readers interested in group theory, particularly those studying symmetric groups and their properties, may find this discussion relevant.

karush
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In $S_3$, find elements α and β such that |α| = 2,|β| = 2, and |αβ| = 3
 
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I hate to be "this guy" again, but a thread title of "412.42" isn't very useful to the community. Please make sure thread titles briefly describe the question being asked. (Wave)
 
karush said:
In $S_3$, find elements α and β such that |α| = 2,|β| = 2, and |αβ| = 3
$S_3$ only has six elements, so you can list them all and do the question by trial and error. The elements consist of three transpositions ($(12)$, $(13)$ and $(23)$) and two 3-cycles ($(123)$ and $(132)$), the remaining element being the identity. Choose two elements with order 2, multiply them together and see whether the product has order 3.
 
karush said:
here is the example I think we are supposed to follow
but...

(123)(123)=?
The question is asking you to find two elements of order 2 whose product has order 3. So, what is the order of a 2-cycle and what is the order of a 3-cycle?
 
so then
$$|\alpha\beta|=(12)(23)=3$$
?
 
karush said:
so then
$$|\alpha\beta|=(12)(23)=3$$
?
If you mean $|\alpha\beta|=|(12)(23)|=3$ then you're on the right track. But you'll need to specify the product $(12)(13)$, rather than just stating that it has order 3.
 
ok, much mahalo,

this stuff is strange!:confused:
 
Last edited:

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