Top

A top is a toy designed to be spun rapidly on the ground, the motion of which causes it to remain precisely balanced on its tip because of inertia. Such toys have existed since antiquity. Traditionally tops were constructed of wood, sometimes with an iron tip, and would be set in motion by aid of a string or rope coiled around its axis which, when pulled quickly, caused a rapid unwinding that would set the top in motion. Today they are often built of plastic, and modern materials and manufacturing processes allow tops to be constructed with such precise balance that they can be set in motion by a simple twist of the fingers and twirl of the wrist without need for string or rope.

Characteristics

The motion of a top is produced in the most simple forms by twirling the stem using the fingers. More sophisticated tops are spun by holding the axis firmly while pulling a string or twisting a stick or pushing an auger. In the kinds with an auger, an internal weight rotates, producing an overall circular motion. Some tops can be thrown, while firmly grasping a string that had been tightly wound around the stem, and the centrifugal force generated by the unwinding motion of the string will set them spinning upon touching ground.

Top (clothing)

A top is clothing that covers at least the chest, but which usually covers most of the upper human body between the neck and the waistline. The bottom of tops can be as short as mid-torso, or as long as mid-thigh. Men's tops are generally paired with pants, and women's with pants or skirts. Common types of tops are t-shirts, blouses and shirts.

Design

The neckline is the highest line of the top, and may be as high as a head-covering hood, or as low as the waistline or bottom hem of the top. A top may be worn loose or tight around the bust or waist, and may have sleeves or shoulder straps, spaghetti straps (noodle straps), or may be strapless. The back may be covered or bare. Tops may have straps around the waist or neck, or over the shoulders.

Types

Neck styles

See also

References

External links

Category of topological spaces

In mathematics, the category of topological spaces, often denoted Top, is the category whose objects are topological spaces and whose morphisms are continuous maps or some other variant; for example, objects are often assumed to be compactly generated. This is a category because the composition of two continuous maps is again continuous. The study of Top and of properties of topological spaces using the techniques of category theory is known as categorical topology.

N.B. Some authors use the name Top for the category with topological manifolds as objects and continuous maps as morphisms.

As a concrete category

Like many categories, the category Top is a concrete category (also known as a construct), meaning its objects are sets with additional structure (i.e. topologies) and its morphisms are functions preserving this structure. There is a natural forgetful functor

to the category of sets which assigns to each topological space the underlying set and to each continuous map the underlying function.

Library (UTA station)

Library is a light rail station in Downtown Salt Lake City, Utah, United States serviced by the Red Line of the Utah Transit Authority's (UTA) TRAX light rail system. The Red Line provides service from the University of Utah to the Daybreak Community of South Jordan.

Description

The station is located at 225 East 400 South (East University Boulevard/SR-186), with the island platform being in the median of 400 South. It is situated immediately north of the main Salt Lake City Public Library building and northwest of the Salt Lake City and County Building. Library is the last eastbound station within the Free Fare Zone in Downtown Salt Lake City. Transportation patrons that both enter and exit bus or TRAX service within the Zone can ride at no charge. As part of the UTA's Art in Transit program, the station features cast bronze books and etched glass windscreens created by Gregg LeFevre entitled By Its Cover. Unlike most TRAX stations, Library does not have a Park and Ride lot. The station is part of a railway right of way that was created specifically for the former University Line. The station was opened on 15 December 2001 as part of the University Line and is operated by the Utah Transit Authority.

Library (journal)

Library was a literary magazine founded in the United States in 1900.

Overview

The magazine was only published over the course of six months, until it ran out of funds.

Willa Cather published five original short stories (The Dance at Chevalier's, The Sentimentality of William Tavener, The Affair at Grover Station, and The Conversion of Sum Loo), sixteen articles and seven poems. She also re-published Peter, A Night at Greenway Court and A Singer's Romance. It has been noted that she was well paid for her contributions.

References

Halo (megastructure)

Halo rings are fictional megastructures and superweapons in the Halo video game series, giving its name. They are referred to as "Installations" by their AI monitors, and are collectively referred to as "the Array" by the installations' creators, the Forerunners. The series' alien antagonists, the Covenant, refer to the structures as the "Sacred Rings", believing them to form part of a greater religious prophecy known as "The Great Journey". According to Halo's fiction, the Forerunners built the rings to contain and study the Flood, an infectious alien parasite. The rings act together as a weapon of last resort; when fired, the rings kill any sentient life capable of falling prey to the Flood, starving the parasite of its food. The installations are at the crux of the plot progression for the Halo series.

The Halos are massive ringworlds, which feature their own wildlife and weather. The constructs resemble Larry Niven's Ringworld concept in shape and design. The structure that Halo: Combat Evolved takes place on was initially to be a hollowed-out planet, but was changed to its ring design later in development; a staff member provided "Halo" as the name for both the ring and the video game after names such as Red Shift were suggested.