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For questions about mathematical notation, i.e. the symbols used to represent mathematical objects and operations.

6 votes
2 answers
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Why are the Dynkin diagrams E6, E7 and E8 always drawn the way they are drawn?

The Dynkin diagrams of type ADE are ubiquitous in mathematics as solutions of various classification problems. The diagram E6 is usually drawn by five dots in a row with a sixth dot above the third, s …
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