Term

Term may refer to:

Lengths of time

Term (architecture)

In Classical architecture a term or terminal figure (plural: terms or termini) is a human head and bust that continues as a square tapering pillar-like form.

The name derives from Terminus, the Roman god of boundaries and boundary markers. If the bust is of Hermes as protector of boundaries in ancient Greek culture, with male genitals interrupting the plain base at the appropriate height, it may be called a herma or herm. The crime of Alcibiades and his drinking-mates, for which Socrates eventually indirectly paid with his life, was the desecration of herm figures through Athens in the dead of night.

At the Temple of Artemis at Ephesus, the Lady of Ephesus, whom the Greeks identified with Artemis, was a many-breasted goddess encased in a tapering term, from which her feet protruded. (See illustration at Temple of Artemis).

In the architecture and the painted architectural decoration of the European Renaissance and the succeeding Classical styles, term figures are quite common. Often they represent minor deities associated with fields and vineyards and the edges of woodland, Pan and fauns and Bacchantes especially, and they may be draped with garlands of fruit and flowers.

Term (logic)

In analogy to natural language, where a noun phrase refers to an object and a whole sentence refers to a fact, in mathematical logic, a term denotes a mathematical object and a formula denotes a mathematical fact. In particular, terms appear as components of a formula.

A first-order term is recursively constructed from constant symbols, variables and function symbols. An expression formed by applying a predicate symbol to an appropriate number of terms is called an atomic formula, which evaluates to true or false in bivalent logics, given an interpretation. For example, is a term built from the constant 1, the variable x, and the binary function symbols and ; it is part of the atomic formula which evaluates to true for each real-numbered value of x.

Besides in logic, terms play important roles in universal algebra, and rewriting systems.

Elementary mathematics

In the context of polynomials, sometimes term is used for a monomial with a coefficient: to 'collect like terms' in a polynomial is the operation of making it a linear combination of distinct monomials. Terms, in this sense, are things that are added or subtracted. A series is often represented as the sum of a sequence of terms. Individual factors in an expression representing a product are multiplicative terms. For example, in 6 + 3x − 2, 6, 3x, and −2 are all terms.

Oil!

Oil! is a novel by Upton Sinclair published in 1927 told as a third person narrative, with only the opening pages written in the second person. The book was written in the context of the Harding administration's Teapot Dome Scandal and takes place in Southern California. It is a social and political satire skewering the human foibles of all its characters.

The main character is James Arnold Ross Jr., nicknamed Bunny, son of an oil tycoon. Bunny's sympathetic feelings toward oilfield workers and socialists provoke arguments with his father throughout the story.

The novel served as a loose inspiration for the 2007 film There Will Be Blood.

Characters

Oil

An oil is any neutral, nonpolar chemical substance that is a viscous liquid at ambient temperatures and is both hydrophobic (immiscible with water, literally "water fearing") and lipophilic (miscible with other oils, literally "fat loving"). Oils have a high carbon and hydrogen content and are usually flammable and slippery.

The general definition of oil includes classes of chemical compounds that may be otherwise unrelated in structure, properties, and uses. Oils may be animal, vegetable, or petrochemical in origin, and may be volatile or non-volatile. They are used for food, fuel, lubrication, and the manufacture of paints, plastics, and other materials. Specially prepared oils are used in some religious ceremonies as purifying agents.

Etymology

First attested in English 1176, the word oil comes from Old French oile, from Latin oleum, which in turn comes from the Greek ἔλαιον (elaion), "olive oil, oil" and that from ἐλαία (elaia), "olive tree", "olive fruit". The earliest attested forms of the word are the Mycenaean Greek 𐀁𐀨𐀺, e-ra-wo and 𐀁𐁉𐀺, e-rai-wo, written in the Linear B syllabic script.

Oil (film)

Oil is a 2009 documentary film directed by Massimiliano Mazzotta. It explores the Italian energy provider Saras S.p.A., operating in the area of oil refining and the production of electricity, located in the island of Sardinia, near Cagliari and the impact of oil development on the land and lives of the local population.

Awards

External links

Instrumental variable

In statistics, econometrics, epidemiology and related disciplines, the method of instrumental variables (IV) is used to estimate causal relationships when controlled experiments are not feasible or when a treatment is not successfully delivered to every unit in a randomized experiment.

Instrumental variable methods allow consistent estimation when the explanatory variables (covariates) are correlated with the error terms of a regression relationship. Such correlation may occur when the dependent variable causes at least one of the covariates ("reverse" causation), when there are relevant explanatory variables which are omitted from the model, or when the covariates are subject to measurement error. In this situation, ordinary linear regression generally produces biased and inconsistent estimates. However, if an instrument is available, consistent estimates may still be obtained. An instrument is a variable that does not itself belong in the explanatory equation and is correlated with the endogenous explanatory variables, conditional on the other covariates. In linear models, there are two main requirements for using an IV: