The maximum number of times a surface can be cut along simple closed curves without the surface separating into disconnected parts. It is the same as the number of handles on the surface.
A surface of genus 1
A category used in the classification of organisms that consists of a number of similar or closely related species. The common name of an organism (especially a plant) is sometimes similar or identical to that of the genus, e.g. Lilium (lily), Crocus, Antirrhinum. Similar genera are grouped into families. See also binomial nomenclature.
See classification.
A class of things that share the same character, but divide into different subclasses or species. The genus summum is the most inclusive genus, not itself serving as a species to another yet more general kind. To define per genus et differentiam is to cite the genus and the differentiated species to which a thing belongs.
- Regional Development Agency
- regional field
- regional geography
- regional inequality
- regional innovation system
- regionalism
- regionalization
- Regionally Important Geological/Geomorphological Sites
- regional metamorphism
- regional multiplier
- Regional Planetary Imaging Data Facility
- regional policy
- regional registry
- regional science
- formal consequence
- formaldehyde
- formal game
- formal implication
- formalin
- formalism
- formalism in art
- formalism, legal
- formalism, logical
- formal language
- formal language theory