two-fold covering
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Covering space — A covering map satisfies the local triviality condition. Intuitively, such maps locally project a stack of pancakes above an open region, U, onto U. In mathematics, more specifically algebraic topology, a covering map is a continuous surjective… … Wikipedia
Covering groups of the alternating and symmetric groups — In the mathematical area of group theory, the covering groups of the alternating and symmetric groups are groups that are used to understand the projective representations of the alternating and symmetric groups. The covering groups were… … Wikipedia
Covering graph — In the mathematical discipline of graph theory, a graph C is a covering graph of another graph G if there is a covering map from the vertex set of C to the vertex set of G. A covering map f is a surjection and a local isomorphism: the… … Wikipedia
fold — 1. A ridge or margin apparently formed by the doubling back of a lamina. SYN: plica. 2. In the embryo, a transient elevation or reduplication of tissue in the form of a lamina … Medical dictionary
Homeodomain fold — The homeodomain fold is a protein structural domain that binds DNA or RNA and is thus commonly found in transcription factors. The fold consists of a 60 amino acid helix turn helix structure in which three alpha helices are connected by short… … Wikipedia
Principal bundle — In mathematics, a principal bundle is a mathematical object which formalizes some of the essential features of a Cartesian product X times; G of a space X with a group G . Analogous to the Cartesian product, a principal bundle P is equipped with… … Wikipedia
Kimono — For the Icelandic band, see Kimono (band). A traditional wedding kimono with tsunokakushi (wedding headpiece) … Wikipedia
USS Wainwright (DD-419) — was a World War II era Sims class destroyer in the service of the United States Navy. The ship was named to honor Jonathan Mayhew Wainwright, his son, Master Jonathan Mayhew Wainwright, Jr., his cousin, Commander Richard Wainwright, and also Rear … Wikipedia
NLRB v. Mackay Radio & Telegraph Co. — NLRB v. Mackay Radio Telegraph Co. Supreme Court of the United States Argued April 5–6, 1938 De … Wikipedia
Nuncio — • An ordinary and permanent representative of the pope, vested with both political and ecclesiastical powers, accredited to the court of a sovereign or assigned to a definite territory with the duty of safeguarding the interests of the Holy See.… … Catholic encyclopedia
Greyhawk — This article is about the role playing game setting. For other uses, see Greyhawk (disambiguation). Greyhawk Designer(s) Gary Gygax Publisher(s) TSR, Inc. Wizards of the Coast Publication date … Wikipedia
