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Linear algebra is essentially the theory of the special root systems A_k.
Vladimir Igorevich Arnol'd, 1998
021/100 days of productivity Some more reflection group stuff.
Excuse me?
I just derived that dihedral groups do not exist.
Excuse me?
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The symmetry operations of a square. Here I denotes identity, s denotes a quarter turn clockwise rotation of the square, and r denotes a mirror reflection of the figure.
