In mathematics, the term Cartan matrix has three meanings. All of these are named after the French mathematician Élie Cartan. In fact, Cartan matrices in the context of Lie algebras were first investigated by Wilhelm Killing, whereas the Killing form is due to Cartan.
Read more about Cartan Matrix: Lie Algebras, Representations of Finite-dimensional Algebras, Cartan Matrices in M-theory
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