topological arrangement
61Flexagon — In geometry, flexagons are flat models made from folded strips of paper that can be folded, or flexed , to reveal a number of hidden faces. They are amusing toys but have also caught the interest of mathematicians.Flexagons are usually square or… …
62Tessellation — A tessellation of pavement A honeycomb is an example of a t …
63Random coil — A random coil is a polymer conformation where the monomer subunits are oriented randomly while still being bonded to adjacent units. It is not one specific shape, but a statistical distribution of shapes for all the chains in a population of… …
64Cyclic order — In mathematics, a cyclic order is a way to arrange a set of objects in a circle.[nb] Unlike most structures in order theory, a cyclic order cannot be modeled as a binary relation a < b . One does not say that east is more clockwise than west.… …
65Electrostatic levitation — is the process of using an electric field to lift a charged object and counteract the effects of gravity. It was used, for instance, in Robert Millikan s oil drop experiment and is used to suspend the gyroscopes in Gravity Probe B during… …
66Reciprocal lattice — In physics, the reciprocal lattice of a lattice (usually a Bravais lattice) is the lattice in which the Fourier transform of the spatial function of the original lattice (or direct lattice) is represented. This space is also known as momentum… …
67Magnetic reconnection — is a physical process in highly conducting plasmas in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration. Magnetic reconnection occurs on timescales intermediate …
68Abstract polytope — In mathematics, an abstract polytope is a combinatorial structure with properties similar to those shared by a more classical polytope. Abstract polytopes correspond to the structures of polygons, polyhedra, tessellations of the plane and higher… …
69List of STEP (ISO 10303) parts — An incomplete list of parts making up STEP (ISO 10303):Descriptions methods* Part 1 Overview and fundamental principles (1994). Unfortunately outdated, not covering the role of AICs and modules. * Part 11 EXPRESS language reference manual * Part… …
70Euclidean plane isometry — In geometry, a Euclidean plane isometry is an isometry of the Euclidean plane, or more informally, a way of transforming the plane that preserves geometrical properties such as length. There are four types: translations, rotations, reflections,… …
