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Eilenberg–MacLane space. In mathematics, specifically algebraic topology, an Eilenberg–MacLane space[note 1] is a topological space with a single nontrivial homotopy group. Let G be a group and n a positive integer. A connected topological space X is called an Eilenberg–MacLane space of type , if it has n -th homotopy group isomorphic to ...
Construction C/80 [ edit ] The tests with smaller caliber long guns, the 15 cm MRK L/28 , the 24 cm L25/5, the 35.5 cm MRK L/25 and the 40 cm MRK L/25 led Krupp to design a whole new series of longer 30 and 35 caliber long guns, the so-called C/80 system.
The King George V-class battleships were the most modern British battleships in commission during the Second World War. Five ships of this class were built: HMS King George V (commissioned 1940), HMS Prince of Wales (1941), HMS Duke of York (1941), HMS Anson (1942) and HMS Howe (1942). The names honoured King George V, and his sons, Edward VIII ...
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Khost-Gardez Pass. The Khost-Gardez Pass, frequently abbreviated as the K-G Pass, and known locally as the Seti-Kandow Pass, or the Satukandav Pass by Soviet forces, is the main land route connecting Khost, the capital of Khost Province, and Gardez, the capital of Paktia province, in eastern Afghanistan. The pass currently consists of a rutted ...
Classifying space. In mathematics, specifically in homotopy theory, a classifying space BG of a topological group G is the quotient of a weakly contractible space EG (i.e., a topological space all of whose homotopy groups are trivial) by a proper free action of G. It has the property that any G principal bundle over a paracompact manifold is ...
The process of assembling the International Space Station (ISS) has been under way since the 1990s. Zarya, the first ISS module, was launched by a Proton rocket on 20 November 1998. The STS-88 Space Shuttle mission followed two weeks after Zarya was launched, bringing Unity, the first of three node modules, and connecting it to Zarya.
The Klein–Gordon equation (Klein–Fock–Gordon equation or sometimes Klein–Gordon–Fock equation) is a relativistic wave equation, related to the Schrödinger equation. It is second-order in space and time and manifestly Lorentz-covariant. It is a differential equation version of the relativistic energy–momentum relation .