Del

Del, or nabla, is an operator used in mathematics, in particular, in vector calculus, as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes its standard derivative as defined in calculus. When applied to a field (a function defined on a multi-dimensional domain), del may denote the gradient (locally steepest slope) of a scalar field (or sometimes of a vector field, as in the Navier–Stokes equations), the divergence of a vector field, or the curl (rotation) of a vector field, depending on the way it is applied.

Strictly speaking, del is not a specific operator, but rather a convenient mathematical notation for those three operators, that makes many equations easier to write and remember. The del symbol can be interpreted as a vector of partial derivative operators, and its three possible meanings—gradient, divergence, and curl—can be formally viewed as the product with a scalar, dot product, and cross product, respectively, of the del "operator" with the field. These formal products do not necessarily commute with other operators or products.

Deel (clothing)

A deel (Mongolian: дээл [teːɮ]; Buryat: дэгэл) is an item of traditional clothing commonly worn since centuries ago among the Mongols and other nomadic tribes of Central Asia, including various Turkic peoples, and can be made from cotton, silk, wool, or brocade. The deel is still commonly worn by both men and women outside major towns, especially by herders. In urban areas, deels are mostly only worn by elderly people, or on festive occasions. The deel appears similar to a caftan or an old European folded tunic. Deels typically reach to below the wearer's knees and fan out at the bottom and are commonly blue, olive, or burgundy, though there are deels in a variety of other colors.

Description

The deel looks like a large overcoat when not worn. Instead of buttoning together in the middle, the sides are pulled against the wearers body, the right flap close to the body with the left covering. On the right side of the wearer are typically 5 or 6 clasps to hold the top flap in place. There is one clasp below the armpit, three at the shoulder, and either one or two at the neckline.

Alpha Delphini

Alpha Delphini (α Del, α Delphini) is a multiple star in the constellation Delphinus. It also has the name Sualocin, which was given to it as a practical joke by the astronomer Niccolò Cacciatore; the name is the Latinized version (Nicolaus) of his given name, spelled backwards.

In Chinese, 瓠瓜 (Hù Guā), meaning Good Gourd, refers to an asterism consisting of α Delphini, γ² Delphini, δ Delphini, β Delphini and ζ Delphini. Consequently, α Delphini itself is known as 瓠瓜一 (Hù Guā yī, English: the First Star of Good Gourd.).

Properties

Alpha Delphini has seven components: A and G, a physical binary, and B, C, D, E, and F, which are optical binaries and have no physical association with A and G.

See also

References

References

Traces

Traces may refer to:

See also

Traces (book)

Traces is a collection of short stories written by British sci-fi author Stephen Baxter. Unlike similar collections such as Vacuum Diagrams and Phase Space, it is not related to any particular series by Baxter (as, for example, Vacuum Diagrams is related to his Xeelee Sequence).

The book contains the following short stories:

Traces (Jean-Jacques Goldman album)

Traces is a 1989 album recorded by French singer-songwriter Jean-Jacques Goldman. It was his second live album and his seventh album overall. It was recorded during the singer's tour 1988, between March and December, in various countries (France, Congo, Belgium). The album was released on 13 March 1989 and spawned two singles which achieved success in France : "Il changeait la vie" (#14), which precedeed the album's release, and "Peur de rien blues" (#17). The album was successful on the French chart.

Success

The album debuted at number two on 9 April 1989 and climbed to number one eight weeks later and stayed there for two consecutive weeks. It was ranked for 24 weeks in the top ten and for 36 weeks in the top 50. A few months after its release, it earned a Platinum disc for over 300,000 copies sold.

The album was briefly ranked on the Swiss Albums Chart, peaking at #30 on 30 April 1989.

Track listing

All songs written, composed and performed by Goldman.