In this paper, we investigate property testing whether or not a degree d multivariate polynomial is a sum of squares or is far from a sum of squares. We show that if we require that the property tester always accepts YES instances and uses random samples, nΩ(d) samples are required, which is not much fewer than it would take to completely determine the polynomial. To prove this lower bound, we ...

A Bjorken sum rule for semileptonic Ω b decays to ground and excited charmed baryon states We derive a Bjorken sum rule for semileptonic Ω b decays to ground and low-lying negative-parity excited charmed baryon states, in the heavy quark limit. We discuss the restriction from this sum rule on form factors and compare it with some models.

the environment impact assessment studies have started with the approval environment impact assessment pattern by sustainable development committee in 1997, but theirs reports are prepared with the different qualities and generally are not comprehensive. therefore, for considering all aspects of environment, complimentary studis are neccessary. althoagh many of iran’s dams have environment impa...

The spectral function ρV −A(s) is determined from ALEPH and OPAL data on hadronic tau decays using a neural network parametrization trained to retain the full experimental information on errors, their correlations and chiral sum rules: the DMO sum rule, the first and second Weinberg sum rules and the electromagnetic mass splitting of the pion sum rule. Nonperturbative QCD vacuum condensates can...

during some decades ago, iran hosted much more afghan refugees. different researches, content analyses of speeches, legislatives interviews and different social news show that negative emotions toward afghans exist among some part of people and legislatives, so that they recognize afghans as criminals. therefore, the purpose of this study was social construction of these negative emotions forma...

Introduction The reliability of a diagnostic test is determined by its specificity and sensitivity. The sensitivity of a diagnostic test is defined as the ratio between the number of true positives and the sum of true positives and false negatives. The specificity of a test is defined as the ratio between true negative results and the sum of the number of true negative results and false positiv...