Cohn Ronald

High Quality Content by WIKIPEDIA articles! A taxon (plural: taxa) is a group of (one or more) organisms, which a taxonomist adjudges to be a unit. Usually a taxon is given a name and a rank, although neither is a requirement. Defining what belongs or does not belong to such a taxonomic group is done by a taxonomist with the science of taxonomy. It is not uncommon for one taxonomist to disagree with another on what exactly belongs to a taxon, or on what exact criteria should be used for inclusion.

High Quality Content by WIKIPEDIA articles! American poetry, the poetry of the United States, arose first as efforts by colonists to add their voices to English poetry in the 17th century, well before the constitutional unification of the thirteen colonies (although before this, a strong oral tradition often likened to poetry existed among Native American societies). Unsurprisingly, most of the early colonists` work relied on contemporary British models of poetic form, diction, and theme. However, in the 19th century, a distinctive American idiom began to emerge. By the later part of that century, when Walt Whitman was winning an enthusiastic audience abroad, poets from the United States had begun to take their place at the forefront of...

High Quality Content by WIKIPEDIA articles! In computer science, a search algorithm is an algorithm for finding an item with specified properties among a collection of items. The items may be stored individually as records in a database; or may be elements of a search space defined by a mathematical formula or procedure, such as the roots of an equation with integer variables; or a combination of the two, such as the Hamiltonian circuits of a graph.

High Quality Content by WIKIPEDIA articles! In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P2 = P. It leaves its image unchanged. Though abstract, this definition of "projection" formalizes and generalizes the idea of graphical projection. One can also consider the effect of a projection on a geometrical object by examining the effect of the projection on points in the object.

High Quality Content by WIKIPEDIA articles! In abstract algebra, the split-complex numbers (or hyperbolic numbers) are a two-dimensional commutative algebra over the real numbers different from the complex numbers. Every split-complex number has the form

High Quality Content by WIKIPEDIA articles! Taxicab geometry, considered by Hermann Minkowski in the 19th century, is a form of geometry in which the usual distance function or metric of Euclidean geometry is replaced by a new metric in which the distance between two points is the sum of the absolute differences of their coordinates. The taxicab metric is also known as rectilinear distance, L1 distance or 1 norm (see Lp space), city block distance, Manhattan distance, or Manhattan length, with corresponding variations in the name of the geometry. The latter names allude to the grid layout of most streets on the island of Manhattan, which causes the shortest path a car could take between two points in the borough to have length equal to...

High Quality Content by WIKIPEDIA articles! The parietal lobe is a part of the Brain positioned above (superior to) the occipital lobe and behind (posterior to) the frontal lobe.

High Quality Content by WIKIPEDIA articles! In mathematics, a spiral is a curve which emanates from a central point, getting progressively farther away as it revolves around the point.

High Quality Content by WIKIPEDIA articles! The Tasmanian Aborigines (Aboriginal name: Parlevar) were the indigenous people of the island state of Tasmania, Australia. Before British colonisation in 1803, there were an estimated 3,000–15,000 Parlevar. A number of historians point to introduced disease as the major cause of the destruction of the full-blooded Aboriginal population.Geoffrey Blainey wrote that by 1830 in Tasmania: "Disease had killed most of them but warfare and private violence had also been devastating." Other historians regard the Black War as one of the earliest recorded modern genocides. Benjamin Madley wrote: "Despite over 170 years of debate over who or what was responsible for this near-extinction, no consensus...

High Quality Content by WIKIPEDIA articles! In mathematics, the spin representations are particular projective representations of the orthogonal or special orthogonal groups in arbitrary dimension and signature (i.e., including indefinite orthogonal groups). More precisely, they are representations of the spin groups, which are double covers of the special orthogonal groups. They are usually studied over the real or complex numbers, but they can be defined over other fields.

High Quality Content by WIKIPEDIA articles! In physics, a spin network is a type of diagram which can be used to represent states and interactions between particles and fields in quantum mechanics. From a mathematical perspective, the diagrams are a concise way to represent multilinear functions and functions between representations of matrix groups. The diagrammatic notation often simplifies calculation because simple diagrams may be used to represent complicated functions. Roger Penrose is credited with the invention of spin networks in 1971, although similar diagrammatic techniques existed before that time.

High Quality Content by WIKIPEDIA articles! In sociology, sociological perspectives, theories, or paradigms are complex theoretical and methodological frameworks used to analyze and explain objects of social study. They facilitate organizing sociological knowledge. Sociological theory is constantly evolving, and can never be presumed to be complete.

High Quality Content by WIKIPEDIA articles! Parasitology is the study of parasites, their hosts, and the relationship between them. As a biological discipline, the scope of parasitology is not determined by the organism or environment in question, but by their way of life. This means it forms a synthesis of other disciplines, and draws on techniques from fields such as cell biology, bioinformatics, biochemistry, molecular biology, immunology, genetics, evolution and ecology.

High Quality Content by WIKIPEDIA articles! Resolution may refer to:

High Quality Content by WIKIPEDIA articles! Parasitism is a type of symbiotic relationship between organisms of different species where one organism, the parasite, benefits at the expense of the other, the host. Traditionally parasite referred to organisms with lifestages that needed more than one host (e.g. Taenia solium). These are now called macroparasites (typically protozoa and helminths). The word parasite now also refers to microparasites, which are typically smaller, such as viruses and bacteria, and can be directly transmitted between hosts of the same species.

High Quality Content by WIKIPEDIA articles! In mathematics, a Fourier series decomposes periodic functions or periodic signals into the sum of a (possibly infinite) set of simple oscillating functions, namely sines and cosines (or complex exponentials). The study of Fourier series is a branch of Fourier analysis.

High Quality Content by WIKIPEDIA articles! In mathematics, the tangent space of a manifold facilitates the generalization of vectors from affine spaces to general manifolds, since in the latter case one cannot simply subtract two points to obtain a vector pointing from one to the other.

High Quality Content by WIKIPEDIA articles! Alecia Beth Moore (born September 8, 1979), better known by her stage name Pink (stylized as P!nk), is an American singer-songwriter, musician and actress. After her short, 3-year career with the contemporary R B girl group Choice, in 2000 she released her first single "There You Go", from her debut album Can`t Take Me Home. The song garnered commercial success, peaking at #7 on the Billboard Hot 100.

High Quality Content by WIKIPEDIA articles! Natica collaria is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.