We introduce a family of extremal polynomials associated with the prolongation of a stratified nilpotent Lie algebra. These polynomials are related to a new algebraic characterization of abnormal subriemannian geodesics in stratified nilpotent Lie groups. They satisfy a set of remarkable structure relations that are used to integrate the adjoint equations.

play is an ancient literary form in the history of human art which has undergone different developments. different ears during which this human art has developed could be classified as: greek, roman, middle ages, classic era, romantic era and realism era. play appeared with preliminary dances and music in religious ceremonies and has developed into modern plays and movies after all the mentione...

Evidence suggests that binding, or encoding a feature with respect to other features in time and space, can convey cognitive advantages. However, evidence across many kinds of stimuli and paradigms presents a mixed picture, alternatively showing cognitive costs or cognitive advantages associated with maintaining bound representations. We examined memory for colored letters drawn from similar an...

The paper analyzes fine art as an alternative investment option in the portfolio of investors. It also sheds light on precautions that should be taken by prospective buyers before putting money artwork. Guidelines provided include researching artist and period choice, working with a trusted dealer for all transactions, evaluating level financial risk involved. concludes is good long term provid...

Background Infertility is a major problem with a prevalence around 9% in the world and a life time prevalence of about 25% in Iran. Assisted reproductive technique (ART), came into the world on 1978 with the birth of Luise Brown, but early days of ART in Iran was not clear. The aim of this study is to investigate the history of ART in Iran and its time line in this Islamic society. MaterialsAnd...

A recent study showed that people evaluate products more positively when they are physically associated with art images than similar non-art images. Neuroimaging studies of visual art have investigated artistic style and esthetic preference but not brain responses attributable specifically to the artistic status of images. Here we tested the hypothesis that the artistic status of images engages...