genus of surface
Смотреть что такое "genus of surface" в других словарях:
Genus-2 surface — A genus 2 surface. In mathematics, a genus 2 surface (also known as a double torus or two holed torus) is a surface formed by the connected sum of two tori. That is to say, from each of two tori the interior of a disk is removed, and the… … Wikipedia
Surface — This article discusses surfaces from the point of view of topology. For other uses, see Differential geometry of surfaces, algebraic surface, and Surface (disambiguation). An open surface with X , Y , and Z contours shown. In mathematics,… … Wikipedia
Genus (mathematics) — In mathematics, genus has a few different, but closely related, meanings:TopologyOrientable surfaceThe genus of a connected, orientable surface is an integer representing the maximum number of cuttings along closed simple curves without rendering … Wikipedia
Genus–degree formula — In classical algebraic geometry, the genus–degree formula relates the degree d of a non singular plane curve with its arithmetic genus g via the formula: A singularity of order r decreases the genus by .[1] Proofs The proof follows immediately… … Wikipedia
Surface of general type — In algebraic geometry, a surface of general type is an algebraic surface with Kodaira dimension 2.These are all algebraic, and in some sense most surfaces are in this class. ClassificationGieseker showed that there is a coarse moduli scheme for… … Wikipedia
Surface of class VII — In mathematics, surfaces of class VII are non algebraic complex surfaces studied by (Kodaira 1964, 1968) that have Kodaira dimension −∞ and first Betti number 1. Minimal surfaces of class VII (those with no rational curves with self… … Wikipedia
Surface de Bolza — Représentation en perspective de l équation y2 = x5 − x dans . En mathématiques, la surface de Bolza (du nom d Oskar Bolza) est une surface de Riemann compacte de g … Wikipédia en Français
genus Culex — noun type genus of the Culicidae: widespread genus of mosquitoes distinguished by holding the body parallel to the resting surface • Syn: ↑Culex • Hypernyms: ↑arthropod genus • Member Holonyms: ↑Culicidae, ↑family Culicidae … Useful english dictionary
genus Branchiobdella — noun type genus of the Branchiobdellidae: a small worm that lives on the gills or surface of a crayfish attached by a sucker • Syn: ↑Branchiobdella • Hypernyms: ↑worm genus • Member Holonyms: ↑Branchiobdellidae, ↑family Branchiobdellidae … Useful english dictionary
genus Lemna — noun minute aquatic herbs floating on or below the water surface of still water consisting of a leaflike frond or plant body and single root • Syn: ↑Lemna • Hypernyms: ↑monocot genus, ↑liliopsid genus • Member Holonyms: ↑Lemnaceae, ↑family… … Useful english dictionary
genus Lycaena — noun type genus of the Lycaenidae; small slender butterflies with upper surface of wings usually metallic blue or green or copper • Syn: ↑Lycaena • Hypernyms: ↑arthropod genus • Member Holonyms: ↑Lycaenidae, ↑family Lycaenidae … Useful english dictionary
