We consider lift-and-project methods for combinatorial optimization problems and focus mostly on those lift-and-project methods which generate polyhedral relaxations of the convex hull of integer solutions. We introduce many new variants of Sherali–Adams and Bienstock– Zuckerberg operators. These new operators fill the spectrum of polyhedral lift-and-project operators in a way which makes all o...

We give new examples of discrete Schrr odinger operators with potentials taking nitely many values that have purely singular continuous spectrum. If the hull X of the potential is strictly ergodic, then the existence of just one potential x in X for which the operator has no eigenvalues implies that there is a generic set in X for which the operator has purely singular continuous spectrum. A su...

We give new examples of discrete Schrδdinger operators with potentials taking finitely many values that have purely singular continuous spectrum. If the hull X of the potential is strictly ergodic, then the existence of just one potential x in X for which the operator has no eigenvalues implies that there is a generic set in X for which the operator has purely singular continuous spectrum. A su...

Let G be a simple non-compact linear Lie group. ? any irreducible unitary representation of with infinitesimal character ? whose continuous part is ?. The beautiful Helgason-Jonson bound in 1969 says that the norm ? upper bounded by ?(G), which stands for half sum positive roots G. current paper aims to give framework sharpen Helgason—Johnson when infinite-dimensional. We have explicit results ...

ion and Decomposition in Hillclimbing Design Optimization Thomas Ellman Mark Schwabacher Department of Computer Science Hill Center for Mathematical Sciences Rutgers University New Brunswick, New Jersey 08903 (908) 932 4184 fellman,[email protected] CAP-TR-14 Abstract The performance of hillclimbing design optimization can be improved by abstraction and decomposition of the design space....

Nowadays, application of high speed crafts with large tonnage is of our country's essences. In order to gain high speed, new multi hull crafts are traditional. A hull form having been used recently in frigates is the Trimaran. Trimaran hull form and motion have been extensively studied due to the development of numerical and analytical methods as well as the exploitation of experimental setup. ...

The objective of this study was to evaluate total phenolic content and antioxidant activity of leaf and different parts of fruit (hull, shell, and kernel) of Bene in Ilam province. Total phenolic content was determined with the Folin- Ciocalteu Reagent (FCR); antioxidant activity of methanolic extracts were examined by DPPH (2,2diphenyl- 1- picrylhydrazyl), FRAP (ferric reducing antioxidant pow...

We present a nonstandard hull construction for locally uniform groups in a spirit similar to Luxembourg’s construction of the nonstandard hull of a uniform space. Our nonstandard hull is a local group rather than a global group. We investigate how this construction varies as one changes the family of pseudometrics used to construct the hull. We use the nonstandard hull construction to give a no...