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A Roman coin with the head of Pompey the Great on the obverse and a ship on the reverse. Coin flipping was known to the Romans as navia aut caput ("ship or head"), as some coins had a ship on one side and the head of the emperor on the other. [1]
Circles on the sphere are, like circles in the plane, made up of all points a certain distance from a fixed point on the sphere. The intersection of a sphere and a plane is a circle, a point, or empty. [18] Great circles are the intersection of the sphere with a plane passing through the center of a sphere: others are called small circles.
The Coxeter matrix, , is related to the Schläfli matrix with entries = (/), but the elements are modified, being proportional to the dot product of the pairwise generators. The Schläfli matrix is useful because its eigenvalues determine whether the Coxeter group is of finite type (all positive), affine type (all non-negative, at least one ...
Avebury (/ ˈ eɪ v b ər i /) is a Neolithic henge monument containing three stone circles, around the village of Avebury in Wiltshire, in south-west England.One of the best-known prehistoric sites in Britain, it contains the largest megalithic stone circle in the world.
The total mass was estimated to be between 10 −7 to 10 −6 the mass of the Moon, or 10–100 times the mass of the Solar System's zodiacal cloud. [135] If such a disc existed around both stars, α Centauri A's disc would likely be stable to 2.8 AU, and α Centauri B's would likely be stable to 2.5 AU [ 135 ] This would put A's disc entirely ...
An equivalent definition of a vector space can be given, which is much more concise but less elementary: the first four axioms (related to vector addition) say that a vector space is an abelian group under addition, and the four remaining axioms (related to the scalar multiplication) say that this operation defines a ring homomorphism from the ...
The tiger (Panthera tigris) is a large cat and a member of the genus Panthera native to Asia.It has a powerful, muscular body with a large head and paws, a long tail and orange fur with black, mostly vertical stripes.
Indus-type and Indus-related artifacts were found over a large and differentiated ecumene, encompassing Central Asia, the Iranian Plateau, Mesopotamia and the northern Levant, the Persian Gulf, and the Oman Peninsula. The discovery of Indus trade tools (seals, weights, and containers) across the entire Middle Asia, complemented by information ...