Mathematics – Representation Theory
Scientific paper
2002-12-16
Mathematics
Representation Theory
6 pages
Scientific paper
The purpose of this note is to give explicit criteria to determine whether a real generalized Cartan matrix is of finite type, affine type or of hyperbolic type by considering the principal minors and the inverse of the matrix. In particular, it will be shown that a real generalized Cartan matrix is of finite type if and only if it is invertible and the inverse is a positive matrix. A real generalized Cartan matrix is of hyperbolic type if and only if it is invertible and the inverse is non-positive.
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