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Position (geometry) Radius vector represents the position of a point with respect to origin O. In Cartesian coordinate system. In geometry, a position or position vector, also known as location vector or radius vector, is a Euclidean vector that represents a point P in space. Its length represents the distance in relation to an arbitrary ...
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New Directions Publishing. 80 8th Avenue, headquarters of New Directions Publishing. New Directions Publishing Corp. is an independent book publishing company that was founded in 1936 by James Laughlin (1914–1997) [1] and incorporated in 1964. Its offices are located at 80 Eighth Avenue in New York City.
Earth's rotation. Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise . The North Pole, also known as the Geographic North ...
Miller index. Miller indices form a notation system in crystallography for lattice planes in crystal (Bravais) lattices . In particular, a family of lattice planes of a given (direct) Bravais lattice is determined by three integers h, k, and ℓ, the Miller indices. They are written ( hkℓ ), and denote the family of (parallel) lattice planes ...
The principal curvatures are the eigenvalues of the matrix of the second fundamental form in an orthonormal basis of the tangent space. The principal directions are the corresponding eigenvectors. Similarly, if M is a hypersurface in a Riemannian manifold N, then the principal curvatures are the eigenvalues of its second-fundamental form.
Germany. / 52.517°N 13.383°E / 52.517; 13.383. Germany, [e] officially the Federal Republic of Germany (FRG), [f] is a country in the western region of Central Europe. It is the second-most populous country in Europe after Russia [g] and the most populous member state of the European Union.
Photosynthesis ( / ˌfoʊtəˈsɪnθəsɪs / FOH-tə-SINTH-ə-sis) [1] is a system of biological processes by which photosynthetic organisms, such as most plants, algae, and cyanobacteria, convert light energy, typically from sunlight, into the chemical energy necessary to fuel their activities.
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