One class of them correspond to irreducible root systems; that class has extended and affine varieties, the latter sort of which can describe Cartan matrices. The Hadwiger conjecture concerns these objects, as does the Robertson-Seymour theorem. Some functors have these objects as domains, and in that situation they are called quivers. The clique number of one of these objects is denoted by omega, and one class of them define a Weiner polynomial and may be represented by an adjacency matrix. One kind, called a forest, disallows cycles, while in quivers, loops are allowed. Forests are so called because they could be considered collections of trees, which are, for 10 points, a subset of what mathematical constructs composed of edges and verti
One class of them correspond to irreducible root systems; that class has extended and affine varieties, the latter sort of which can describe Cartan matrices. The Hadwiger conjecture concerns these objects, as does the Robertson-Seymour theorem. Some functors have these objects as domains, and in that situation they are called quivers. The clique number of one of these objects is denoted by omega, and one class of them define a Weiner polynomial and may be represented by an adjacency matrix. One kind, called a forest, disallows cycles, while in quivers, loops are allowed. Forests are so called because they could be considered collections of trees, which are, for 10 points, a subset of what mathematical constructs composed of edges and vertices?
One class of them correspond to irreducible root systems; that class has extended and affine varieties, the latter sort of which can describe Cartan matrices.
graphs