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November 4th, 2009, 03:24 PM
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| | help w/ Orbits and Stabilizers So in my abstract algebra class today we went over Orbits and Stabilizers, but my teacher did a horrible job of explaining it, and the book isn't much help either, so I was wondering if anyone had any nice online tutorials about orbits & stabiliziers, or if someone here could just explain the general concept and what the "point" of them are. We also discussed group actions and that didn't seem to make much sense easier. I guess I understand what orbits and stabilizers are, but I'm failing to see how they fit into the bigger picture of abstract algebra. | 
November 4th, 2009, 05:36 PM
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Originally Posted by jmoney90 So in my abstract algebra class today we went over Orbits and Stabilizers, but my teacher did a horrible job of explaining it, and the book isn't much help either, so I was wondering if anyone had any nice online tutorials about orbits & stabiliziers, or if someone here could just explain the general concept and what the "point" of them are. We also discussed group actions and that didn't seem to make much sense easier. I guess I understand what orbits and stabilizers are, but I'm failing to see how they fit into the bigger picture of abstract algebra. | What exactly do you mean "how it fits into the bigger picture"? How the concept of orbits is applied? A pretty classic proof that a permutation cannot be both odd and even relies heavily on orbits? Also, the definition of a cycle (in most cases) is a permutation that has at most one orbit containing more than one element. The length of a cycle is the number of elements in it's largest orbit. | 
November 4th, 2009, 09:53 PM
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Originally Posted by jmoney90 So in my abstract algebra class today we went over Orbits and Stabilizers, but my teacher did a horrible job of explaining it, and the book isn't much help either, so I was wondering if anyone had any nice online tutorials about orbits & stabiliziers, or if someone here could just explain the general concept and what the "point" of them are. We also discussed group actions and that didn't seem to make much sense easier. I guess I understand what orbits and stabilizers are, but I'm failing to see how they fit into the bigger picture of abstract algebra. |
Any decent book in algebra (Dummit and Foote, Hungerford, Lang, Hershtein, etc.) covers this topic, which is one of the most important and far-reaching in group theory, with many branches in many other parts of modern mathematics, so you better get a good grasp of it now, that you're beginning to study it.
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