lifted topology
21Prosh (University of Adelaide) — Prosh at the University of Adelaide is organised by the Students Association [ [http://www.saua.adelaide.edu.au/news/events/ Students Association of the University of Adelaide ] ] . Prosh began in 1905, students used the occasion to poke fun at… …
22Cartography — Cartographer redirects here. For the album by E.S. Posthumus, see Cartographer (album). A nautical chart of the Mediterranean Sea from the second quarter of the 14th century. It is the oldest original cartographic artifact in the Library of… …
23Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] …
24Wightman axioms — Quantum field theory (Feynman diagram) …
25Group extension — In mathematics, a group extension is a general means of describing a group in terms of a particular normal subgroup and quotient group. If Q and N are two groups, then G is an extension of Q by N if there is a short exact sequence:1 ightarrow N… …
26Functor category — In category theory, a branch of mathematics, the functors between two given categories can themselves be turned into a category; the morphisms in this functor category are natural transformations between functors. Functor categories are of… …
27Swedish telephone plugs & sockets — A standard Swedish telephone plug carries one telephone line and has four flat metal pins and one plastic pin. The design is only used in Sweden and older installations in Iceland (RJ11 and a data/voice standard using an 8P8C modular connector… …
28Injective sheaf — In mathematics, injective sheaves of abelian groups are used to construct the resolutions needed to define sheaf cohomology (and other derived functors, such as sheaf Ext .). There is a further group of related concepts applied to sheaves: flabby …
29Cotangent complex — In mathematics the cotangent complex is a roughly a universal linearization of a morphism of geometric or algebraic objects. Cotangent complexes were originally defined in special cases by a number of authors. Luc Illusie, Daniel Quillen, and M.… …
