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The geometry of some two-character sets

Antonio Cossidente, Nicola Durante, Giuseppe Marino, Tim Penttila, Alessandro Siciliano
2007 Designs, Codes and Cryptography  
A projective (n, d, w 1 , w 2 ) q set (or a two-character set for short) is a set S of n points of PG(d − 1, q) with the properties that the set generates PG(d − 1, q) and that every hyperplane meets the  ...  Here geometric constructions of some two-character sets are given. The constructions mainly involve commuting polarities, symplectic polarities and normal line-spreads of projective spaces.  ...  We remark that most of the two-character sets we constructed in this paper have the same parameters as the sets constructed in [3, Sect. 7, Example SU2] but they have a different geometry.  ... 
doi:10.1007/s10623-007-9155-5 fatcat:2qtqopwfxnaijjmm7kugfkujzq

Введение расстояния взаимодействия в контексте геометрии расстояния для движений человека

Antonio Mucherino
2019 Чебышевский сборник  
Notice that, from a formal point of view, the only particularity of the dynDGP (w.r.t a standard distance geometry problem) is the fact that the vertex set of is the set product of two sets: (the objects  ...  Some initial works have shown that tools for distance geometry can be employed in this context [2, 17] , but they consider, as in the majority of the applications in distance geometry, the Euclidean distance  ... 
doi:10.22405/2226-8383-2019-20-2-273-283 fatcat:uigfix6fkrazdbs35zmqfsr4qq

Slicing Hyperdimensional Oranges: The Geometry of Phylogenetic Estimation

Junhyong Kim
2000 Molecular Phylogenetics and Evolution  
Each of these objects is placed in a vector space where the character patterns are the basis vectors.  ...  This viewpoint allows intuitive understanding of various complex properties of the phylogenetic estimation problem structure.  ...  Geometry of Model Manifolds Given the characterization of stochastic tree models as manifolds, it is useful to first discuss some general properties of the geometry of the tree model manifolds.  ... 
doi:10.1006/mpev.2000.0816 pmid:11020305 fatcat:amedgb4wgfe6zlke7syljebvtq

Page 136 of Psychological Review Vol. 43, Issue 2 [page]

1936 Psychological Review  
By casting a doubt on the axiomatic character of parallel lines resulting from the construction of two lines, both of which are in the same plane and at right angles to a third line in the same plane,  ...  and assuming that no parallels exist, non- Euclidean geometry claimed that the sum of the angles of a triangle is greater than two right angles (23).  ... 

Page 372 of Mathematics Teacher Vol. 29, Issue 8 [page]

1936 Mathematics Teacher  
the geometry of real per- 16 A Set of Postulates for Plane Geomet!  ...  The modern teaching of geometr with the emphasis on intuition as a basis, properly speaking, a union of the two.  ... 

Characters of Abelian Groups

R. E. A. C. Paley, N. Wiener
1933 Proceedings of the National Academy of Sciences of the United States of America  
that the product of two functions satisfying (1) is another VOL. 19, 1933 25i3 function also satisfying (1), so that the set of characters of the group form another group themselves.  ...  We studied some simple questions of this geometry in our first paper, especially rectilinear and circular solutions.  ... 
doi:10.1073/pnas.19.2.253 pmid:16587765 pmcid:PMC1085939 fatcat:ykig2oh3jjbi3nlwyxuxwijpaq

Independence in combinatiorial geometries of rank three

Japheth Hall
1975 Canadian mathematical bulletin  
In Section 2, some properties of the sequence {P n } neN and the function P 00 associated with the line structure P for a combinatorial geometry (V, S) of rank  ...  The line structure for (V, S) is the function P:2 V ->2 V defined as follows: If X^ V, then P(Z)=X if X is a singleton set, and P(X) is the union of all Ye S such that F contains at least two elements  ...  In Section 2, some properties of the sequence {P n } neN and the function P 00 associated with the line structure P for a combinatorial geometry (V, S) of rank three are developed.  ... 
doi:10.4153/cmb-1975-042-9 fatcat:r54itllju5d2ravqghqgvx2f2i

CFD ANALYSIS OF THE SPACER GRIDS AND MIXING VANES EFFECT ON THE FLOW IN THE CHOSEN PART OF THE TVSA-T FUEL ASSEMBLY

Jakub Juklíček, Václav Železný
2015 Acta Polytechnica  
Some inevitable geometry simplifications of the spacer grid geometry were performed.  ...  Vortex structures disappear approximately 50 mm behind the mixing vanes but the basic spiral character of the flow is preserved in the whole area between two following spacer grids.</p>  ...  Acknowledgements This work was done as partial fulfilment of the requirements for the degree of Master of Science in Nuclear Power Devices at the Czech Technical University in Prague, Faculty of Mechanical  ... 
doi:10.14311/ap.2015.55.0324 fatcat:kps2v3clnveflfsimpsijknog4

Quantum process and the foundation of relational theories of space-time [article]

M. Lorente
2003 arXiv   pre-print
The relations among these objects are the base for a pregeometry of discrete character, the continuous limit of which gives rise to the physical properties of the space and time.  ...  We present current theories about the structure of space and time, where the building blocks are some fundamental entities (yes-no experiment, quantum processes, spin net-work, preparticles) that do not  ...  time. 2 Some modern theories about the relational character of space and time We don't want to go again in the arguments given by the two positions.  ... 
arXiv:gr-qc/0312119v1 fatcat:ix2i4dv5zrhw3mqfrwgqduvwsm

The Chronicles of Narnia

Brad Hiebert, Jubin Dave, Tae-Yong Kim, Ivan Neulander, Hans Rijpkema, Will Telford
2006 ACM SIGGRAPH 2006 Courses on - SIGGRAPH '06  
This was done by allowing animators to publish a character, which would bake out the animation into two resolutions of cached geometry files.  ...  Centaurs The centaurs for the show were some of the most challenging characters.  ... 
doi:10.1145/1185657.1185719 dblp:conf/siggraph/HiebertDKNRT06 fatcat:aqly6kdyvvbbteosaq2nfmjrym

Page 3291 of Mathematical Reviews Vol. , Issue 83h [page]

1983 Mathematical Reviews  
If m=4 and g=2 two other descriptions of a partial geometry with the (dual) parameters of pg(2) are known.  ...  Section 2 uses character theory to prove some well-known results on graphs and to demonstrate a method for proving the nonexistence of Moore graphs of diameter greater than 2.  ... 

Tifinagh Character Recognition Using Geodesic Distances, Decision Trees & Neural Networks

O Bencharef, M.Fakir, B. Minaoui, B.Bouikhalene
2011 International Journal of Advanced Computer Science and Applications  
The recognition of Tifinagh characters cannot be perfectly carried out using the conventional methods which are based on the invariance, this is due to the similarity that exists between some characters  ...  In this paper we propose a direct method based on the calculation of what is called Geodesic Descriptors which have shown significant reliability vis-à-vis the change of scale, noise presence and geometric  ...  This paper is organized as follows: section two provides an overview on Tifinagh characters, section three describes some of the basic notions of Riemannian geometry and explains the method we applied,  ... 
doi:10.14569/specialissue.2011.010308 fatcat:vu3vesagtnea5gsaxbavtdsl3q

A THEORETICAL INVESTIGATION OF THE Si - Si DOUBLE BOND IN A SERIES OF SUBSTITUTED DISILENES

L. Andersen, M. Dabney, H.A. Harris
1994 Main Group Metal Chemistry  
Previous theoretical investigations of disilenes have concentrated on the geometry and stability of disilene, Si 2 H 4 , in the singlet state, relative to its geometry and stability in the lowest lying  ...  Inclusion of d-orbital functions in the silicon basis set reverses these states. The goal of this study is to investigate the bonding in the known disilenes and to compare  ...  In order to further study the effect of aromatic ring substituents, calculations were done on tetraphenyl disilene in two geometries, one corresponding to the mesityl geometry (two rings approximately  ... 
doi:10.1515/mgmc.1994.17.6.403 fatcat:3rsd5gs7gvhajfzdmjkjuf2noi

Page 340 of Mathematical Reviews Vol. , Issue 98A [page]

1998 Mathematical Reviews  
The z-character of a filter is the cardinality of the smallest set that is dense (in the partial order sense) in the filter; the z- character of a Boolean algebra is the sup of the z-characters of its  ...  The paper under review serves as a clear, self-contained, read- ily accessible, fairly elementary introduction to some of the ideas in sub-Riemannian geometry.  ... 

Page 338 of IBM Journal of Research and Development Vol. 2, Issue 4 [page]

1958 IBM Journal of Research and Development  
338 lows some simple rules that are set down very precisely. To discover a proof, on the other hand, requires ingenuity and imagination.  ...  The rules formalized into the vector function that transforms the character of a problem into a sequence of designated methods of approach and the estimated merit of each will in general fall into two  ... 
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