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Displaying 61 – 80 of 80

Spherical F-tilings by triangles and $r$ -sided regular polygons, $r \geq 5$ .

Avelino, Catarina P., Santos, Altino F. (2008)

The Electronic Journal of Combinatorics [electronic only]

Steinhaus chessboard theorem

Władysław Kulpa, Lesƚaw Socha, Marian Turzański (2000)

Acta Universitatis Carolinae. Mathematica et Physica

Surface Projective Convexe de volume fini

Ludovic Marquis (2012)

Annales de l’institut Fourier

Une surface projective convexe est le quotient d’un ouvert proprement convexe $Ω$ de l’espace projectif réel $ℙ^{2} (ℝ)$ par un sous-groupe discret $Γ$ de ${SL}_{3} (ℝ)$ . Nous donnons plusieurs caractérisations du fait qu’une surface projective convexe est de volume fini pour la mesure de Busemann. On en déduit que si $Ω$ n’est pas un triangle alors $Ω$ est strictement convexe, à bord $𝒞^{1}$ et qu’une surface projective convexe $S$ est de volume fini si et seulement si la surface duale est de volume fini.

Symmetry groups and fundamental tilings for the compact surface of genus $3^{-}$ . II: The normalizer diagram with classification.

Molnár, Emil, Stettner, Eleonóra (2005)

Beiträge zur Algebra und Geometrie

The architecture of viral capsids based on tiling theory.

Twarock, R. (2005)

Journal of Theoretical Medicine

The Construction of Self-similar Tilings.

R. Kenyon (1996)

Geometric and functional analysis

Tile-transitive partial tilings of the plane.

Huson, Daniel H. (1993)

Beiträge zur Algebra und Geometrie

Tiling and spectral properties of near-cubic domains

Mihail N. Kolountzakis, Izabella Łaba (2004)

Studia Mathematica

We prove that if a measurable domain tiles ℝ or ℝ² by translations, and if it is "close enough" to a line segment or a square respectively, then it admits a lattice tiling. We also prove a similar result for spectral sets in dimension 1, and give an example showing that there is no analogue of the tiling result in dimensions 3 and higher.

Tiling Polygons with Parallelograms.

S. Kannan, D. Soroker (1992)

Discrete & computational geometry

Tiling with L's and squares.

Chinn, Phyllism, Grimaldi, Ralph, Heubach, Silvia (2007)

Journal of Integer Sequences [electronic only]

Tilings and isoperimetrical shapes I: Square lattice

Sylvain Gravier, Charles Payan (2001)

Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

Tilings and isoperimetrical shapes. II. Hexagonal lattice

Sylvain Gravier (2001)

Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

Tilings associated with non-Pisot matrices

Maki Furukado, Shunji Ito, E. Arthur Robinson (2006)

Annales de l’institut Fourier

Suppose $A \in G l_{d} (ℤ)$ has a 2-dimensional expanding subspace $E^{u}$ , satisfies a regularity condition, called “good star”, and has $A^{*} \geq 0$ , where $A^{*}$ is an oriented compound of $A$ . A morphism $θ$ of the free group on ${1, 2, \dots, d}$ is called a non-abelianization of $A$ if it has structure matrix $A$ . We show that there is a tiling substitution $Θ$ whose “boundary substitution” $θ = \partial Θ$ is a non-abelianization of $A$ . Such a tiling substitution $Θ$ leads to a self-affine tiling of $E^{u} \sim ℝ^{2}$ with $A_{u} {: = A |}_{E_{u}} \in G L_{2} (ℝ)$ as its expansion. In the last section we find conditions on $A$ so...

Tilings of convex polygons

Richard Kenyon (1997)

Annales de l'institut Fourier

Call a polygon rational if every pair of side lengths has rational ratio. We show that a convex polygon can be tiled with rational polygons if and only if it is itself rational. Furthermore we give a necessary condition for an arbitrary polygon to be tileable with rational polygons: we associate to any polygon $P$ a quadratic form $q (P)$ , which must be positive semidefinite if $P$ is tileable with rational polygons.The above results also hold replacing the rationality condition with the following: a polygon...

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