Root system data for type A infinity

sage.combinat.root_system.type_A_infinity.CartanType

The Cartan type \(A_{\infty}\).

We use NN and ZZ to explicitly differentiate between the \(A_{+\infty}\) and \(A_{\infty}\) root systems, respectively. While oo is the same as +Infinity in Sage, it is used as an alias for ZZ.