ARC (file format)

ARC is a lossless data compression and archival format by System Enhancement Associates (SEA). It was very popular during the early days of networked dial-up BBS. The file format and the program were both called ARC. The ARC program made obsolete the previous use of a combination of the SQ program to compress files and the LU program to create .LBR archives, by combining both compression and archiving functions into a single program. Unlike ZIP, ARC is incapable of compressing entire directory trees. The format was subject to controversy in the 1980s—an important event in debates over what would later be known as open formats.

The .arc file extension is often used for several file archive-like file types. For example, the Internet Archive uses its own ARC format to store multiple web resources into a single file. The FreeArc archiver also uses .arc extension, but uses a completely different file format.

Nintendo uses an unrelated 'ARC' format for resources, such as MIDI, voice samples, or text, in GameCube and Wii games. Several unofficial extractors exist for this type of ARC file.

Arc (projective geometry)

A (simple) arc in finite projective geometry is a set of points which satisfies, in an intuitive way, a feature of curved figures in continuous geometries. Loosely speaking, they are sets of points that are far from "line-like" in a plane or far from "plane-like" in a three-dimensional space. In this finite setting it is typical to include the number of points in the set in the name, so these simple arcs are called k-arcs. An important generalization of the k-arc concept, also referred to as arcs in the literature, are the (k, d)-arcs.

k-arcs in a projective plane

In a finite projective plane π (not necessarily Desarguesian) a set A of k (k ≥ 3) points such that no three points of A are collinear (on a line) is called a k - arc. If the plane π has order q then k ≤ q + 2, however the maximum value of k can only be achieved if q is even. In a plane of order q, a (q + 1)-arc is called an oval and, if q is even, a (q + 2)-arc is called a hyperoval.

Every conic in the Desarguesian projective plane PG(2,q), i.e., the set of zeros of an irreducible homogeneous quadratic equation, is an oval. A celebrated result of Beniamino Segre states that when q is odd, every (q + 1)-arc in PG(2,q) is a conic. This is one of the pioneering results in finite geometry.

Directed graph

In mathematics, and more specifically in graph theory, a directed graph (or digraph) is a graph, or set of vertices connected by edges, where the edges have a direction associated with them. In formal terms, a directed graph is an ordered pair G = (V, A) (sometimes G = (V, E)) where

It differs from an ordinary or undirected graph, in that the latter is defined in terms of unordered pairs of vertices, which are usually called edges, arcs, or lines.

A directed graph is called a simple digraph if it has no multiple arrows (two or more edges that connect the same two vertices in the same direction) and no loops (edges that connect vertices to themselves). A directed graph is called a directed multigraph or multidigraph if it may have multiple arrows (and sometimes loops). In the latter case the arrow set forms a multiset, rather than a set, of ordered pairs of vertices.

Sasha

Sacha, Sasha, Saschs or variant may refer to:

See also

Sasha Gradiva

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Sasha Mikhailovna Antonova (Russian: Саша Михайловна Антонова, born 5 February 1989), better known by her stage name Sasha Gradiva, is a Russian-born American singer, songwriter, producer and performing artist. Her music is a blend of pop dance with infusions of electronica. She began her professional career at the age of 16, and has gained recognition within the European music scene, on MTV and in the Russian music industry.

Making a transition to the US music scene, Sasha attracted press attention when attending at the 54th Annual Grammy Awards. Gradiva met American producer Tricky Stewart and soon after released her first US single "Wanted". It was co-written with Justin Tranter of Semi Precious Weapons and produced by Stewart and Norwegian producer Axident. She has gained recognition within the club dance scene and has been referred to by Hot Spot Magazine and Gay Pride as "one of the most promising artists in the mainstream US music scene."

Pita-Ten

Pita-Ten (Japanese: ぴたテン, Hepburn: Pitaten) is a Japanese manga by Koge-Donbo. It was serialized in Dengeki Comic Gao! between the October 1999 and August 2003 issues and was later collected into eight volumes. The eight volumes were localized for North America by Tokyopop; Madman Entertainment used Tokyopop's translations for distribution in Australasia. The plot follows Kotarou Higuchi who becomes acquainted with the angel Misha and the demon Shia.

Pita-Ten has spun off an anthology manga, art books, a light novel series, and an anime; the anime resulted in a radio program and audio disc releases such as soundtracks and image songs. Tokyopop's volumes of Pita-Ten have appeared on ICv2's monthly top one-hundred selling graphic novels. English reviewers gave small praise for the plot and artwork and generally described the series as cute.

Plot

Kotarou Higuchi is befriended by his neighbor Misha, an angel-in-training.^[ch. 1] He is later acquainted with Shia, a demon, who is searching for something she had forgotten.^[ch. 7] Kotarou continues his daily life until Shia absorbs his life energy and leaves town.^[ch. 28] Kotarou investigates and discovers Shia is his great-grandmother who is searching for his dying great-grandfather, Taro Higuchi.^[ch. 35] After the revelation, Shia mourns Taro's death before she also dies.^[ch. 38] Afterwards, Kotarou learns that Misha's test involves helping Kotarou find happiness; regardless of the result, the two will separate when the test's deadline is reached.^[ch. 45] Realizing Heaven's true intent, Kotarou asks Misha to rid him of his ability to see angels as he has to search for happiness himself. His actions allow Misha to become an angel and the two return to their separate lives.^[ch. 47]