In mathematics, a conic section (or simply conic) is a curve obtained as the intersection of a cone with a plane. The three types of conic section are the hyperbola, the parabola, and the ellipse. The circle is a special case of the ellipse, and is of sufficient interest in its own right that it was sometimes called a fourth type of conic section. The conic sections have been studied by the ancient Greek mathematicians with this work culminating around 200 BC, when Apollonius of Perga undertook a systematic study of their properties.
There are many distinguishing properties that the conic sections of the Euclidean plane have and many of these can, and have been, used as the basis for a definition of the conic sections. A geometric property that has been used defines a non-circular conic to be the set of those points whose distances to some particular point, called a focus, and some particular line, called a directrix, are in a fixed ratio, called the eccentricity. The type of conic is determined by the value of the eccentricity. In analytic geometry, a conic may be defined as a plane algebraic curve of degree 2, that is, as the set of points whose coordinates satisfy a quadratic equation in two variables. This equation may be written in matrix form and some geometric properties can be studied as algebraic conditions.
Professional wrestling has accrued a considerable nomenclature through its long existence. Much of it stems from the industry's origins in the days of carnivals and circuses, and the slang itself is often referred to as "carny talk." In the past, wrestlers used such terms in the presence of fans so as not to reveal the worked nature of the business. In recent years, widespread discussion on the Internet has popularized these terms. Many of the terms refer to the financial aspects of pro wrestling in addition to performance-related terms.
"Turn" is the fourth single from Indie band Travis' second studio album, The Man Who. The single peaked at the number eight position on the UK Singles Chart.
Two music videos were shot for the single. The first video, included on the group's Singles DVD, features Healy engaged in a push-up contest. This video was filmed in Hackney on a dis-used council estate. The estate has since been demolished. The second featured a staged performance by the band.
The British release of the single was accompanied by a cover of Britney Spears's hit single "...Baby One More Time". Spears herself heard the Travis version while shopping, and commented by saying it was 'a total shock' and was 'a very good cover'.
Turn is an album by American jazz saxophonist Roscoe Mitchell which was recorded in 2005 and released on the French RogueArt label. He leads a new quintet with longtime rhythm section Jaribu Shahid on bass and Tani Tabbal on drums, pianist Craig Taborn and new Art Ensemble of Chicago trumpeter Corey Wilkes.
In his review for AllMusic, Alain Drouot states "This is a remarkably focused and concise date featuring Mitchell's brand of atonal jazz mixed with his interests in other musical forms."
The All About Jazz review by Kurt Gottschalk says "As a whole, the group is comfortable together, ready to let the compositions stand and while Shahid and Tabal haven't been the most exciting parts of Mitchell's groups, here they sound better than ever."