"Arena" is a science fiction short story by Fredric Brown that was first published in the June 1944 issue of Astounding magazine. Members of the Science Fiction Writers of America selected it as one of the best science fiction stories published before the advent of the Nebula Awards, and as such it was included in The Science Fiction Hall of Fame Volume One, 1929-1964.
The Star Trek episode "Arena" had some similarity to this story, so to avoid legal problems, it was agreed that Brown would receive payment and a story credit. An Outer Limits episode, "Fun and Games", also has a similar plot, as does an episode of Blake's 7, titled "Duel".
Marvel Comics' Worlds Unknown issue 4 (November 1973) featured a faithful adaptation of the story.
The mysterious Outsiders have skirmished with Earth's space colonies and starships. Their vessels are found to be faster and more maneuverable, but less well armed. There have been no survivors of the small raids on Earth forces so Earth has no information about the Outsiders. Fearing the worst, Earth builds a war fleet. Scouts report a large armada approaching the solar system. Earth's defenders go to meet them. All indications are that the two fleets are evenly matched.
The Pula Arena is the name of the amphitheatre located in Pula, Croatia. The Arena is the only remaining Roman amphitheatre to have four side towers and with all three Roman architectural orders entirely preserved. It was constructed in 27 BC – 68 AD and is among the six largest surviving Roman arenas in the World. A rare example among the 200 Roman surviving amphitheatres, it is also the best preserved ancient monument in Croatia.
The amphitheatre is depicted on the reverse of the Croatian 10 kuna banknote, issued in 1993, 1995, 2001 and 2004.
The exterior wall is constructed in limestone. The part facing the sea consists of three stories, while the other part has only two stories since the amphitheatre was built on a slope. The maximum height of the exterior wall is 29.40 m (96.5 ft). The first two floors have each 72 arches, while the top floor consists of 64 rectangular openings.
The axes of the elliptical amphitheatre are 132.45 and 105.10 m (434.5 and 344.8 ft) long, and the walls stand 32.45 m (106.5 ft) high. It could accommodate 23,000 spectators in the cavea, which had forty steps divided into two meniani. The seats rest directly on the sloping ground; The field for the games, the proper arena, measured 67.95 by 41.65 m (222.9 by 136.6 ft). The field was separated from the public by iron gates.
Arena is an independent Australian radical and critical publishing group. It has been publishing continuously since 1963. Currently, its principal publications are the political and cultural Arena Magazine (6 times per year), and the twice-yearly theoretical publication Arena Journal. Their concerns initially found expression in the practical and theoretical quarterly, Arena, which ran from 1963 to 1992 and was then transformed into the two different publications that continue today.
Though the quarterly Arena commenced as a New Left magazine with a commitment to extending Marxist approaches by developing an account of intellectual practices, its subsequent debates and theoretical work, and engagements with critical theory, media theory, post-structuralism and postmodernism, have led it to develop an approach known as the 'constitutive abstraction' approach. This is connected to an associated lineage of engaged theory. All of these are underpinned by a preoccupation with the questions of social abstraction, including the abstraction of intellectual practices. They include a special emphasis on the cultural and social contradictions of globalised hi-tech society, which the Arena editors took to be misrepresented within prevailing media theory and post-structuralism.
In abstract algebra, the term associator is used in different ways as a measure of the nonassociativity of an algebraic structure.
For a nonassociative ring or algebra , the associator is the multilinear map
given by
Just as the commutator measures the degree of noncommutativity, the associator measures the degree of nonassociativity of .
It is identically zero for an associative ring or algebra.
The associator in any ring obeys the identity
The associator is alternating precisely when is an alternative ring.
The associator is symmetric in its two rightmost arguments when is a pre-Lie algebra.
The nucleus is the set of elements that associate with all others: that is, the n in R such that
It turns out that any two of being
implies that the third is also the zero set.
A quasigroup Q is a set with a binary operation such that for each a,b in Q,
the equations
and
have unique solutions x,y in Q. In a quasigroup Q, the
associator is the map
defined by the equation
Nucleus was a British-European advocacy group, the forerunner to British Influence (sometimes The Centre for British Influence). Nucleus was based in London, with additional operations in Brussels.
Founded in 2010, Nucleus promoted a 'euro-realist' British approach to European political and business affairs. As well as regular bulletins, Nucleus produced commentaries, and hosted briefings, seminars, and networking events both in London and Brussels. Nucleus was unaffiliated with any political party, and was a partner in both the British Brussels Network, along with Business for New Europe, the British Chamber of Commerce in Belgium, and the Institute of Chartered Accountants in England and Wales, and the pan-European EuropAssociation.
In 2013 Nucleus relaunched as British Influence, with a heavier campaigning focus, in response to the call by Prime Minister David Cameron for an in/out referendum on the UK's European Union membership
Nucleus is the second full-length studio album by the Swedish progressive rock band Anekdoten. The album was released in 1995.
Additional personnel: