Using Sylow's Counting to Classify Groups of Order 44

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Homework Help Overview

The discussion revolves around classifying groups of order 44 using Sylow's counting theorems. The original poster seeks to demonstrate that a group G of this order has a normal subgroup of order 11 and to explore the implications for classifying all such groups.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the number of subgroups of order 11 and apply Sylow's first theorem to establish the existence of such a subgroup. There is exploration of the conditions under which this subgroup is normal. Questions arise regarding the classification of groups of order 44 based on the number of Sylow 2-subgroups.

Discussion Status

The conversation is active, with participants sharing insights about the implications of having a normal subgroup of order 11. Some guidance has been offered regarding the potential structure of G based on the number of Sylow 2-subgroups, but no consensus has been reached on the classification of all groups of order 44.

Contextual Notes

Participants note the relevance of Sylow's theorems and the implications of subgroup orders, but there are still open questions about how to fully classify the groups in question. The discussion reflects a mix of established results and ongoing inquiry.

mathusers
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Hi last one here. Any hints on this is appreciated too :)

Let G be a group of order 44. Show using Sylow's counting that G has a normal subgroup of order 11. Use the results to classify all groups of order 44.
 
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How many subgroups of order 11 are there? (There are a bunch of other threads about Sylow counting arguments just like this one.)
 
ok here is what i have managed to get so far

By Sylow's 1st theorem, G has a subgroup of order 11. let n_p be the number of sylow p-subgroups. then n_{11} = 1(mod 11) and n_{11} divides 2^2 (=4) so n_{11}=1. Therefore, it must be a normal subgroup (since it has no distinct conjugates).How can we use this to classify all groups of order 44 though?
 
Well, what are your thoughts? The obvious thing is to think about the Sylow 2s. There's either 1 or 11 of them (why?). If there's just 1, say H, then G is isomorphic to the direct product of H and the Sylow 11 (why?). Now what?

Scenario 2: there's 11 Sylow 2s. Take one of them and play around with it and with the Sylow 11. Remember that the Sylow 11 is cyclic and normal in G -- this will probably be useful in getting a presentation for G.
 

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