Coxeter groups are a class of finite groups that are defined by rather siple relations but that are of great importance in many parts of algebra (for example, I also use them in a large part of my research). 
They have an interesting classification and can be studied by rather elementary methods.

Coxeter groups are a class of finite groups that are defined by rather siple relations but that are of great importance in many parts of algebra (for example, I also use them in a large part of my research).
They have an interesting classification and can be studied by rather elementary methods.

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