Depression Glass and Nested Symmetry Groups
نویسنده
چکیده
Depression glass was enormously popular in 1930’s-40’s U.S. It contains many beautiful examples of centrally symmetric design patterns, reflecting the recent introduction of machine made glassware. Depression glass also demonstrates a phenomenon that occurs in many kinds of design patterns: Nested symmetry groups that emphasize various elements, or relations between elements, within the designs. We show several examples of such glassware, with descriptions of the various types of symmetry groups that apply to these examples.
منابع مشابه
Uniqueness of Parisi's Scheme for Replica Symmetry Breaking
Replica symmetry breaking in spin glass models is investigated using elements of the theory of permutation groups. It is shown how the various types of symmetry breaking give rise to special algebras and that Parisi's scheme may be uniquely characterized by two simple conditions on these algebras, namely transposition symmetry and simple extensibility. An alternative to the Parisi scheme is sho...
متن کاملDetection of Ornithobilharzia turkestanikum cercaria (trematoda) by nested-PCR in intermediate host snail, Lymnaea gedrosiana
Trematodes are important in economic and public health. Ornithobilharzia turkestanicum (O. turkestanicum) is one of the important economic trematodes in domestic animals. Ornithobilharzia infection in intermediate host (Lymnaea gedrosiana ) can be detected by either exposing snails to light to induce cercarial shedding or by squeezing them between glass slides to detect parasites. The current...
متن کاملComputational determination of character table and symmetry of fullerenes cage as C24 and C28
Fullerene chemistry is nowadays a well-established field of both theoretical and experimental investigations. This study considers the symmetry of small fullerenes cage C24 and C28. Using PM3 program for C24 and C28 fullerenes, Oh and Td symmetry were confirmed, respectively. The mentioned algorithm to compute the automorphism group of these fullerenes with connectivity and geometry of th...
متن کاملCalculations of Dihedral Groups Using Circular Indexation
In this work, a regular polygon with $n$ sides is described by a periodic (circular) sequence with period $n$. Each element of the sequence represents a vertex of the polygon. Each symmetry of the polygon is the rotation of the polygon around the center-point and/or flipping around a symmetry axis. Here each symmetry is considered as a system that takes an input circular sequence and g...
متن کاملReplica Symmetry Breaking in an Axial Model of Quadrupolar Glass
We perform the replica symmetry breaking (RSB) in the vicinity of the point of instability of the replica symmetric solution in the model of axial quadrupolar glass. It is shown that the solution with the first stage RSB is stable against the second stage RSB. Although there is no reflection symmetry the 1RSB solution bifurcates continuously from the RS one. These facts mean that our model can ...
متن کامل