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A Morin surface seen from "above" Sphere eversion process as described in [1] Paper sphere eversion and Morin surface Paper Morin surface (sphere eversion halfway) with hexagonal symmetry In differential topology , sphere eversion is a theoretical process of turning a sphere inside out in a three-dimensional space (the word eversion means ...
Morin surface seen from the top Morin surface seen from the side paper sphere eversion and Morin surface paper Morin surface (sphere eversion halfway) with hexagonal symmetry. The Morin surface is the half-way model of the sphere eversion discovered by Bernard Morin. It features fourfold rotational symmetry.
Inspired by the 1937 science fiction novel Star Maker by Olaf Stapledon, [5] the physicist and mathematician Freeman Dyson was the first to formalize the concept of what became known as the "Dyson sphere" in his 1960 Science paper "Search for Artificial Stellar Sources of Infra-Red Radiation". Dyson theorized that as the energy requirements of ...
A globe is a spherical model of Earth, of some other celestial body, or of the celestial sphere. Globes serve purposes similar to maps, but, unlike maps, they do not distort the surface that they portray except to scale it down. A model globe of Earth is called a terrestrial globe. A model globe of the celestial sphere is called a celestial globe.
The 3-sphere is the boundary of a -ball in four-dimensional space. The -sphere is the boundary of an -ball. Given a Cartesian coordinate system, the unit -sphere of radius can be defined as:
Red hot-air balloon, made from gores of material Single-use American WW II aircraft drop tanks, made of impregnated paper cylinders closed by gores formed into hemispheric shapes Globes of the Earth and the celestial sphere were first mass-produced by Johannes Schöner using a process of printing map details on 12 paper gores that were cut out ...
A sphere (from Greek σφαῖρα, sphaîra) [1] is a geometrical object that is a three-dimensional analogue to a two-dimensional circle.Formally, a sphere is the set of points that are all at the same distance r from a given point in three-dimensional space. [2]
Dyson's paper and his lectures presented Feynman's theories of QED in a form that other physicists could understand, facilitating the physics community's acceptance of Feynman's work. J. Robert Oppenheimer, in particular, was persuaded by Dyson that Feynman's new theory was as valid as Schwinger's and Tomonaga's.