class preserving
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Mapping class group — In mathematics, in the sub field of geometric topology, the mapping class group is an important algebraic invariant of a topological space. Briefly, the mapping class group is a discrete group of symmetries of the space. Contents 1 Motivation 2… … Wikipedia
Edge preserving smoothing — is an image processing technique where the edge information is preserved during the smoothing process. It uses non linear operator which is able to remove texture and noise, while keeping edges and corners. The technique is known also as edge and … Wikipedia
Euler class — In mathematics, specifically in algebraic topology, the Euler class, named after Leonhard Euler, is a characteristic class of oriented, real vector bundles. Like other characteristic classes, it measures how quot;twisted quot; the vector bundle… … Wikipedia
British Rail Class 310 — Infobox EMU name = British Rail Class 310 imagesize = 300px caption = Class 310 train in British Railways plain blue calls at Harrow and Wealdstone station. The driving cab features wrap around windows as originally fitted to these trains.… … Wikipedia
NZR D class (1874) — NZR D class D 140, preserved and in operation at the Ferrymead Railway Power type Steam Builder … Wikipedia
British Rail Class D20/2 — Infobox Locomotive name = British Rail Class D20/2 powertype = Diesel hydraulic caption = roadnumber = D600–D604 totalproduction = 5 nicknames = “Warships” builder = North British Locomotive Co. serialnumber = 27660–27664 builddate = 1958–1959… … Wikipedia
LNER Peppercorn Class A1 60163 Tornado — Infobox Locomotive name= LNER Class A1 Peppercorn 60163 Tornado powertype= Steam caption= Tornado , 8 August 2008 designer= Arthur Peppercorn (original designer) builder= A1 Steam Locomotive Trust builddate= 1994 2008 whytetype= Whyte|4 6 2… … Wikipedia
Green's relations — In mathematics, Green s relations are five equivalence relations that characterise the elements of a semigroup in terms of the principal ideals they generate. The relations are named for James Alexander Green, who introduced them in a paper of… … Wikipedia
Orthodiagonal quadrilateral — An orthodiagonal quadrilateral. According to the characterization of these quadrilaterals, the two red squares on two opposite sides of the quadrilateral have the same total area as the two blue squares on the other pair of opposite sides. In… … Wikipedia
moderate — I (Roget s IV) modif. 1. [Not expensive] Syn. inexpensive, low priced, medium priced, reasonable, within reason, modest, inexorbitant, not excessive, not dear, average, nominal, at par, usual, inconsiderable, marked down, at a bargain, half price … English dictionary for students
Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… … Universalium
