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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.


marked as duplicate by Pete L. Clark, Jan Weidner, Steve Huntsman, José Figueroa-O'Farrill, Scott Morrison Nov 4 '10 at 11:56

This question was marked as an exact duplicate of an existing question.

  • $\begingroup$ Isn't this question just a subjective version of this one? mathoverflow.net/questions/6781/ade-type-dynkin-diagrams $\endgroup$ – j.c. Nov 4 '10 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 Nov 4 '10 at 10:42
  • $\begingroup$ Okay, you are right, I did not spot this question before. $\endgroup$ – Jan Weidner Nov 4 '10 at 10:44

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

  • 1
    $\begingroup$ Nice example :) $\endgroup$ – Jan Weidner Nov 4 '10 at 10:44
  • $\begingroup$ It's more an AC/DC style classification $\endgroup$ – Peter Arndt Nov 19 '14 at 2:03

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