Characterization of singular graphs can be reduced to the non-trivial solutions of a system of linear homogeneous equations Ax = 0 for the 0-1 adjacency matrix A. A graph G is singular of nullity η(G) ≥ 1, if the dimension of the nullspace ker(A) of its adjacency matrix A is η(G). Necessary and sufficient conditions are determined for a graph to be singular in terms of admissible induced subgra...

This paper analyzes the different jurisprudential lines on prescription of restitution action derived from nullity expenses terms. Additionally, it carries out a critical analysis informative note Spanish Ministry Consumer Affairs that determines initial date limitation period since publication Supreme Court judgment 23 December 2015.