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ADE type Dynkin diagrams

What is your favorite ADE-style classification? Here ADE style is to be understood in a very broad sense. A classification which is not precisely ADE, but roughly related is fine. For example simple complex Lie algebras, or affine Weyl groups would be okay.

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  • $\begingroup$ Isn't this question just a subjective version of this one? mathoverflow.net/questions/6781/ade-type-dynkin-diagrams $\endgroup$
    – j.c.
    Commented Nov 4, 2010 at 10:30
  • $\begingroup$ I agree with jc: this question is a duplicate. (Also the linked to question does not use the word "favorite", the usage of which in a MO question I have come to deprecate.) $\endgroup$
    – Pete L. Clark
    Commented Nov 4, 2010 at 10:42
  • $\begingroup$ Okay, you are right, I did not spot this question before. $\endgroup$
    – Jan Weidner
    Commented Nov 4, 2010 at 10:44

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Electric plugs!! It has a few more extra types, exactly as your simple complex Lie algebras...

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    $\begingroup$ Nice example :) $\endgroup$
    – Jan Weidner
    Commented Nov 4, 2010 at 10:44
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    $\begingroup$ It's more an AC/DC style classification $\endgroup$
    – Peter Arndt
    Commented Nov 19, 2014 at 2:03

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