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Let F be a 2-transitive group of finite degree v such that the stabilizer T xy of the distinct points x and y fixes precisely k points, where 2 < k < v. The only known non-solvable groups with this property are of the following types: (i) a 2-transitive collineation group of PG(d, 2) for some d; (ii) a 2-transitive collineation group of AG(d, k) for some d; and (iii) PFL(2, 8) in its representa...
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We review the energy spectrum and transport properties of several types of one-dimensional superlattices (SLs) on single-layer and bilayer graphene. In single-layer graphene, for certain SL parameters an electron beam incident on an SL is highly collimated. On the other hand, there are extra Dirac points generated for other SL parameters. Using rectangular barriers allows us to find analytical ...
متن کاملReference points suitable for evaluation of the additional arch length required for leveling the curve of Spee
OBJECTIVE The additional arch length required for leveling (AALL) the curve of Spee (COS) can be estimated by subtracting the two-dimensional (2D) arch circumference, which is the projection of the three-dimensional (3D) arch circumference onto the occlusal plane, from the 3D arch circumference, which represents the arch length after leveling the COS. The purpose of this study was to determine ...
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ژورنال
عنوان ژورنال: Deutsches Aerzteblatt Online
سال: 2019
ISSN: 1866-0452
DOI: 10.3238/arztebl.2019.0175a