In education systems that support pluralism, students or parents can choose the type of school university they attend. Given heterogeneity in priorities for what should be taught, pluralism has a value itself. It may also boost schooling and learning. The fact there is clear, otherwise we would not have different types schools. What less clear extent to which are pluralistic. Rather than lookin...

We show that for every graph G contains two edge-disjoint spanning trees, we can choose trees T1,T2 of such |dT1(v)−dT2(v)|≤5 all v∈V(G). also prove the more general statement positive integer k, there is a constant ck∈O(logk) k T1,…,Tk satisfying |dTi(v)−dTj(v)|≤ck v∈V(G) and i,j∈{1,…,k}. This resolves conjecture Kriesell.

This Symposium has focused primarily on recent efforts by several states of the United States to regulate greenhouse gas (GHG) emissions. These state-level efforts include common law liability actions (such as public nuisance lawsuits) brought by several states against large GHG emitters.1 They also include states’ regulation of GHG emissions from mobile sources (such as California’s 2002 law r...