Universal Scaling in Saddle-Node Bifurcation Cascades (I)
  A saddle-node bifurcation cascade is studied in the logistic equation, whose bifurcation points follow an expression formally identical to the one given by Feigenbaum for period doubling cascade. The Feigenbaum equation is generalized because it rules several objects, which do not have to be orbits. The outcome is that an attractor of attractors appears, and information about the birth, death and scaling of windows is obtained. 
Jes\'us San-Mart\'in