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This article uses the standard notation ISO 80000-2, which supersedes ISO 31-11, for spherical coordinates (other sources may reverse the definitions of θ and φ): . The polar angle is denoted by [,]: it is the angle between the z-axis and the radial vector connecting the origin to the point in question.
A coordinate system conversion is a conversion from one coordinate system to another, with both coordinate systems based on the same geodetic datum.
The adjective Cartesian refers to the French mathematician and philosopher René Descartes, who published this idea in 1637 while he was resident in the Netherlands.It was independently discovered by Pierre de Fermat, who also worked in three dimensions, although Fermat did not publish the discovery. [1]
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Del can also be applied to a vector field with the result being a tensor. The tensor derivative of a vector field v {\displaystyle \mathbf {v} } (in three dimensions) is a 9-term second-rank tensor – that is, a 3×3 matrix – but can be denoted simply as ∇ ⊗ v {\displaystyle \nabla \otimes \mathbf {v} } , where ⊗ {\displaystyle \otimes ...
Renewing Romania's European Project (Romanian: Reînnoim Proiectul European al României, REPER) is a political party in Romania. It is a splinter of the Save Romania Union (USR) and is currently led by Dragoș Pîslaru and Ramona Strugariu as co-presidents. The party was founded in May 2022, in opposition to USR's leadership under Cătălin ...
The Platform for Democracy, Prosperity, and Progress (Romanian: Platforma pentru Democrație, Prosperitate și Progres) is an electoral alliance of four political parties (REPER, Demos, ACUM, and Volt) formed to contest the 2024 Romanian parliamentary election.
Another method of deriving vector and tensor derivative identities is to replace all occurrences of a vector in an algebraic identity by the del operator, provided that no variable occurs both inside and outside the scope of an operator or both inside the scope of one operator in a term and outside the scope of another operator in the same term ...