Group Theory II Symmetry Groups

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Why are groups so popular? Well, in part it is because of their ability to characterise symmetries. This makes them a powerful tool in physics, where symmetry underlies our whole understanding of the fundamental forces.

In this introduction to group theory, I explain the symmetry group of the equilateral triangle (the dihedral group of order 3). Including rotation and mirror symmetries. We also look in a bit more detail at the group structure.
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can you find the symmetries of a non regular tetrahedron?

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