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The azimuthal angle is denoted by. φ ∈ [ 0 , 2 π ] {\displaystyle \varphi \in [0,2\pi ]} : it is the angle between the x -axis and the projection of the radial vector onto the xy -plane. The function atan2 (y, x) can be used instead of the mathematical function arctan (y/x) owing to its domain and image. The classical arctan function has an ...
As the name implies the curl is a measure of how much nearby vectors tend in a circular direction. In Einstein notation, the vector field has curl given by: where = ±1 or 0 is the Levi-Civita parity symbol . For a tensor field of order k > 1, the tensor field of order k is defined by the recursive relation where is an arbitrary constant vector.
Del. Del, or nabla, is an operator used in mathematics (particularly in vector calculus) as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes the standard derivative of the function as defined in calculus. When applied to a field (a function ...
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Central Italy encompasses four of the country's 20 regions: . Lazio; the Marches (Marche); Tuscany (Toscana); Umbria; The easternmost and southernmost parts of Lazio (Cittaducale, Amatrice, Sora, Cassino, Isola del Liri, Sperlonga, Fondi, Gaeta and Formia districts, as well as the islands of Ponza and Ventotene) are sometimes connected to Southern Italy (the so-called Mezzogiorno) for cultural ...
Control-Alt-Delete. Control-Alt-Delete (often abbreviated to Ctrl+Alt+Del and sometimes called the "three-finger salute" or "Security Keys") [ 1][ 2] is a computer keyboard command on IBM PC compatible computers, invoked by pressing the Delete key while holding the Control and Alt keys: Ctrl + Alt + Delete. The function of the key combination ...
Ctrl+Alt+Del (CAD) is a gaming-related webcomic [1] and animated series written by Tim Buckley. The name of the comic refers to the Windows command Control-Alt-Delete . [ 2 ] Premiering on October 23, 2002, the comic's focus has gradually shifted away from single strip gags towards longer story arcs and greater continuity through the use of ...
Italy, officially the Italian Republic, is a country in Southern and Western Europe. It is located on a peninsula that extends into the middle of the Mediterranean Sea, with the Alps on its northern land border, as well as islands, notably Sicily and Sardinia. Italy shares its borders with France, Switzerland, Austria, Slovenia and two enclaves ...