χ-bounded classes are studied here in the context of star colorings and, more generally, χp-colorings. This fits to a general scheme sparsity and leads natural extensions notion bounded expansion class. In this paper we solve two conjectures related coloring (i.e. χ2) boundedness. One is disproved fact determine which weakening holds true. χp-boundedness stability give structural characterizati...

Calculi are used to reason about functional languages from a theoretical perspective. They allows us to make bold statements about programs based on sound and correct deductive methods. Methods of visualization allow us to gain a better understanding of the communication and interaction involved between processes. Often, graphs are used because of the level of intuition they can bring to a syst...