Affine Dynkin diagrams
The affine Dynkin diagrams or Euclidean diagrams are certain extensions of the Dynkin diagrams by inserting an additional node. A complete list is graph

Of particular importance are the Affine ADE graphs.
The affine Dynkin diagrams or Euclidean diagrams are certain extensions of the Dynkin diagrams by inserting an additional node. A complete list is graph

Of particular importance are the Affine ADE graphs.