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started something at ADE classification, but am out of steam (and time) now.
simply laced Dynkin diagrams of types A, D and E (but excluding type B and C)
Simply laced excludes B and C by definition right ? This is in a confusing contradiction with the usage of the word “but” in brackets…
I have added a section here discussing how one may see, via $N = 2$ super Yang-Mills theory, why and how the finite subgroups of $SU(2)$ corresponding to some Dynking diagram are related to the compact simpl Lie groups corresponding to the same Dynkin diagram.
cross-linked with Gabriel’s theorem
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