The structure of dual ascent methods is particularly well-suited for taking advantage of good initial dual solutions of minimum cost flow problems. For this reason, these methods are extremely efficient for reoptimization and sensitivity analysis. In the absence of prior knowledge of a good initial dual solution, one may attempt to find such a solution by means of a heuristic initialization. RE...

In theories with extra dimensions, the cosmological hierarchy problem can be thought of as unnaturally large radius observable universe in Kaluza-Klein units. We sketch a dynamical mechanism that relaxes this. early scenario we propose, three spatial dimensions arise through tunneling from 'cosmic egg', an effectively one-dimensional configuration all compact and comparable, small size. If stri...