American sculptor Tony Smith designed "“Tau”" in the early 1960s. It is 14’ high x 12’ wide x 12’ deep, and made from black painted steel. Its title refers to the Greek letter 'T', which also describes the shape of the sculpture. Fascinated by mathematics, biology and crystals, Smith designed Tau with geometry at its root. There are two extant versions of the large sculpture: Tau (AP), and Tau (1/3).
Many of Smith's sculptures were made up of a space lattice: groupings of simple platonic solids, in Tau's case two such solids, octahedrons and tetrahedrons. The original model for the sculpture was created by Smith in 1961-62 using his signature process of joining small cardboard tetrahedrons, a process he began while recuperating after a severe automobile accident in the spring of 1961.
During this period, Smith was transitioning from his 20-year career in architecture to focus on painting and making sculptures. Smith had also started teaching at Hunter College, New York, in 1962. It took over 20 years for the piece to be installed outside the upper east side college at the 6 train's 68th Street entrance in 1984. In 2004, Hunter College held an exhibition, "Tracing Tau", curated by William C. Agee that offered an insight into the sculpture and its beginnings through paper models, drawings and plans of the work.
The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spelled out as "pi" (/paɪ/).
Being an irrational number, π cannot be expressed exactly as a fraction (equivalently, its decimal representation never ends and never settles into a permanent repeating pattern). Still, fractions such as 22/7 and other rational numbers are commonly used to approximate π. The digits appear to be randomly distributed; however, to date, no proof of this has been discovered. Also, π is a transcendental number – a number that is not the root of any non-zero polynomial having rational coefficients. This transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge.
Ancient civilizations needed the value of π to be computed accurately for practical reasons. It was calculated to seven digits, using geometrical techniques, in Chinese mathematics and to about five in Indian mathematics in the 5th century CE. The historically first exact formula for π, based on infinite series, was not available until a millennium later, when in the 14th century the Madhava–Leibniz series was discovered in Indian mathematics. In the 20th and 21st centuries, mathematicians and computer scientists discovered new approaches that, when combined with increasing computational power, extended the decimal representation of π to, as of 2015, over 13.3 trillion (1013) digits. Practically all scientific applications require no more than a few hundred digits of π, and many substantially fewer, so the primary motivation for these computations is the human desire to break records. However, the extensive calculations involved have been used to test supercomputers and high-precision multiplication algorithms.
The tau (τ), also called the tau lepton, tau particle, or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin of 1⁄2. Together with the electron, the muon, and the three neutrinos, it is a lepton. Like all elementary particles with half-integral spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin, which in the tau's case is the antitau (also called the positive tau). Tau particles are denoted by τ− and the antitau by τ+.
Tau leptons have a lifetime of 6987290000000000000♠2.9×10−13 s and a mass of 7003177682000000000♠1776.82 MeV/c2 (compared to 7002105700000000000♠105.7 MeV/c2 for muons and 6999511000000000000♠0.511 MeV/c2 for electrons). Since their interactions are very similar to those of the electron, a tau can be thought of as a much heavier version of the electron. Because of their greater mass, tau particles do not emit as much bremsstrahlung radiation as electrons; consequently they are potentially highly penetrating, much more so than electrons. However, because of their short lifetime, the range of the tau is mainly set by their decay length, which is too small for bremsstrahlung to be noticeable: their penetrating power appears only at ultra high energy (above PeV energies).
A business, also known as an enterprise, agency or a firm, is an entity involved in the provision of goods and/or services to consumers. Businesses are prevalent in capitalist economies, where most of them are privately owned and provide goods and services to customers in exchange for other goods, services, or money. Businesses may also be social not-for-profit enterprises or state-owned public enterprises targeted for specific social and economic objectives. A business owned by multiple individuals may be formed as an incorporated company or jointly organised as a partnership. Countries have different laws that may ascribe different rights to the various business entities.
Business can refer to a particular organization or to an entire market sector, e.g. "the music business". Compound forms such as agribusiness represent subsets of the word's broader meaning, which encompasses all activity by suppliers of goods and services. The goal is for sales to be more than expenditures resulting in a profit.
"Business" is a song by American rapper Eminem from his fourth studio album The Eminem Show (2002). "Business" was released as the final single from The Eminem Show in July 2003. The single was not released in the United States.
"Business" is a hip hop song of four minutes and eleven seconds in length. It sees Eminem comparing himself and Dr. Dre, the song's producer, to fictional crime-fighting duo Batman and Robin, a comparison first explored in the music video for the previous Eminem single "Without Me". The lyrics are backed by a "cartoonish" beat: one of several Dr. Dre productions on The Eminem Show which, according to CultureDose writer Marty Brown, affords Eminem a "perfect sound-scape" to inspire emotions in the listener, calling the beat "a launchpad equally effective for humor or anger". Writing for Pitchfork Media, Ethan P. noted the "cartoonish" production to be similar in style to several of Eminem's early singles, claiming it to be fitting to the Batman and Robin theme on "Business", but noted that "this time he's actually talking about Batman and Robin!!". DX Magazine editor J-23 called this "classic" with Dre beats. Kris Ex On "Business": "Em names himself the gatekeeper of hip-hop and obliquely claims to be the best rapper alive: "The flow's too wet/Nobody close to it/Nobody says it, but everybody knows the shit."
A business route (occasionally city route) in the United States and Canada is a short special route connected to a parent numbered highway at its beginning, then routed through the central business district of a nearby city or town, and finally reconnecting with the same parent numbered highway again at its end.
Business routes always have the same number as the routes they parallel. For example, U.S. 1 Business is a loop off, and paralleling, U.S. Route 1, and Interstate 40 Business is a loop off, and paralleling, Interstate 40.
In some states, a business route is designated by adding the letter "B" after the number instead of placing a "Business" sign above it. For example, Arkansas signs US business route 71 as "US 71B". On some route shields and road signs, the word "business" is shortened to just "BUS". This abbreviation is rare and usually avoided to prevent confusion with bus routes.
Signage of business routes varies, depending on the type of route they are derived from. Business routes paralleling U.S. and state highways usually have exactly the same shield shapes and nearly the same overall appearance as the routes they parallel, with a rectangular plate reading "BUSINESS" placed above the shield (either supplementing or replacing the directional plate, depending on the preference of the road agency). In order to better identify and differentiate alternate routes from the routes they parallel, some states such as Maryland are beginning to use green shields for business routes off U.S. highways. In addition, Maryland uses a green shield for business routes off state highways with the word "BUSINESS" in place of "MARYLAND" is used for a state route.