Trac

Trac is an open source, Web-based project management and bug tracking system. The program is inspired by CVSTrac, and was originally named svntrac due to its ability to interface with Subversion. It is developed and maintained by Edgewall Software.

Trac is written in the Python programming language. Until mid-2005, it was available under the GNU General Public License; since version 0.9, it has been released under a modified BSD license.

Features

Trac allows hyperlinking information between a bug database, revision control and wiki content. It also serves as a Web interface to the following revision control systems: Subversion, Git, Mercurial, Bazaar, Perforce and Darcs. Prior to version 0.11, the web front end presentation of Trac was handled by the ClearSilver template system. Starting with 0.11, an in-house template system called Genshi is used, although compatibility with ClearSilver-based plugins will remain for several versions.

Other features include:

Lego Technic

Technic is a line of Lego interconnecting plastic rods and parts. The purpose of this series is to create more advanced models with more complex movable arms, such as machines with wheels, in addition to the simpler brick-building properties of normal LEGO.

The concept was introduced as the Expert Builder series and originally Technical Sets in 1977, and was renamed Technic in 1984.

Technic sets are often characterised by the presence of special pieces, such as gears, axles, pins, and beams. Some sets also come with pneumatic pieces or electric motors. In recent years, technic pieces have begun filtering down into other Lego sets as well, the power miners, and others, but mostly notably the BIONICLE sets (which were once sold as part of the Technic line), as well as a great many others.

The style of technic sets has been changing over time. Technic sets produced since the year 2000 use a different construction method, described as "studless construction" (Studs are the small circular knobs which appear on traditional Lego bricks). This method utilises beams and pins rather than technic bricks.

Power function

In mathematics, a power function is a function of the form : where and are constant real numbers and is a variable. The domain of a power function can sometimes be all real numbers, but generally a non-negativity is used to avoid problems with simplifying. The domain of definition is determined by each individual case.

Power functions are a special case of power law relationships, which appear throughout mathematics and statistics.

See also

Lego

Lego (/ˈlɛɡoʊ/) is a line of plastic construction toys that are manufactured by The Lego Group, a privately held company based in Billund, Denmark. The company's flagship product, Lego, consists of colorful interlocking plastic bricks accompanying an array of gears, figurines called minifigures, and various other parts. Lego pieces can be assembled and connected in many ways, to construct objects such as vehicles, buildings, and working robots. Anything constructed can then be taken apart again, and the pieces used to make other objects.

The Lego Group began manufacturing the interlocking toy bricks in 1949. Since then a global Lego subculture has developed. Supporting movies, games, competitions, and six Legoland amusement parks have been developed under the brand. As of July 2015, 600 billion Lego parts had been produced.

In February 2015, Lego replaced Ferrari as Brand Finance's "world's most powerful brand".

History

The Lego Group began in the workshop of Ole Kirk Christiansen (1891–1958), a carpenter from Billund, Denmark, who began making wooden toys in 1932. In 1934, his company came to be called "Lego", derived from the Danish phrase leg godt, which means "play well". In 1947, Lego expanded to begin producing plastic toys. In 1949 Lego began producing, among other new products, an early version of the now familiar interlocking bricks, calling them "Automatic Binding Bricks". These bricks were based in part on the Kiddicraft Self-Locking Bricks, which were patented in the United Kingdom in 1939 and released in 1947. Lego modified the design of the Kiddicraft brick after examining a sample that they received from the supplier of an injection-molding machine that Lego purchased. The bricks, originally manufactured from cellulose acetate, were a development of the traditional stackable wooden blocks of the time.