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Let D d,k denote the discriminant variety of degree d polynomials in one variable with at least one of its roots being of multiplicity ≥ k. We prove that the tangent cones to D d,k span D d,k−1 thus, revealing an extreme ruled nature of these varieties. The combinatorics of the web of affine tangent spaces to D d,k in D d,k−1 is directly linked to the root(More)
We consider the problem of whether it is possible to improve the Novikov inequalities for closed 1-forms, or any other inequalities of a similar nature , if we assume, additionally, that the given 1-form is harmonic with respect to some Riemannian metric. We show that, under suitable assumptions, it is impossible. We use a theorem of E.Calabi C],(More)
PURPOSE To evaluate the safety and efficacy of switching from bevacizumab to ranibizumab in patients with neovascular age-related macular degeneration. METHODS Retrospective study of patients with neovascular age-related macular degeneration initially treated with bevacizumab and switched to ranibizumab. Visual acuity and central retinal thickness (CRT)(More)
OBJECTIVE To assess the outcome and risk factors for failure of pneumatic retinopexy (PR) in eyes with primary rhegmatogenous retinal detachment (RRD). METHODS Data of patients who underwent PR for the repair of primary RRD, from January 1, 2000, through June 30, 2011, were retrieved from medical records and retrospectively analyzed. Patients with a(More)
PURPOSE The European Society of Cataract & Refractive Surgeons (ESCRS) study reported a decrease in endophthalmitis rates from 0.34 % to 0.08 % with the use of intracameral cefuroxime. The purpose of this study was to compare the endophthalmitis rates before and after the introduction of intracameral cefuroxime (ICC) routinely at the end of cataract(More)
This paper examines the relationships between warfare, taxation, and politic institutions in historical perspective. We focus on nineteenth-century Italy from the end of the Napoleonic era in 1815 to political unification in 1861. The institutional variety at the regional level makes the Italian peninsula a unique testing ground for comparative work. Using(More)
We examine the long-term links between state capacity and economic performance. Our database is novel and spans 11 countries and 4 centuries in Europe, the birthplace of modern economic growth. A dynamic simultaneous equation panel model indicates that the performance effects of states with modern extractive and productive capabilities are significant,(More)
IMPORTANCE Assessing the effect of ocriplasmin availability on the management of full-thickness macular holes (MHs) is important for vitreoretinal surgeons and their patients. Such an assessment can indicate whether the use of ocriplasmin will bring a paradigm shift in treating MHs or will be just an additional option relevant to a small group of patients.(More)