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  2. Del in cylindrical and spherical coordinates - Wikipedia

    en.wikipedia.org/wiki/Del_in_cylindrical_and...

    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. 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.

  3. Animal disease model - Wikipedia

    en.wikipedia.org/wiki/Animal_disease_model

    An animal model (short for animal disease model) is a living, non-human, often genetic-engineered animal used during the research and investigation of human disease, for the purpose of better understanding the disease process without the risk of harming a human. Although biological activity in an animal model does not ensure an effect in humans ...

  4. Triple product - Wikipedia

    en.wikipedia.org/wiki/Triple_product

    The vector triple product is defined as the cross product of one vector with the cross product of the other two. The following relationship holds: The following relationship holds: a × ( b × c ) = ( a ⋅ c ) b − ( a ⋅ b ) c {\displaystyle \mathbf {a} \times (\mathbf {b} \times \mathbf {c} )=(\mathbf {a} \cdot \mathbf {c} )\mathbf {b ...

  5. Triangle of U - Wikipedia

    en.wikipedia.org/wiki/Triangle_of_U

    The code in the "Chr.count" column specifies the total number of chromosomes in each somatic cell, and how it relates to the number n of chromosomes in each full genome set (which is also the number found in the pollen or ovule), and the number x of chromosomes in each component genome.

  6. Triangle of reference - Wikipedia

    en.wikipedia.org/wiki/Triangle_of_reference

    The triangle of reference, or semiotic triangle. Figure taken from page 11 of The Meaning of Meaning.. The triangle of reference (also known as the triangle of meaning [1] and the semiotic triangle) is a model of how linguistic symbols relate to the objects they represent.

  7. Ella Langley - Wikipedia

    en.wikipedia.org/wiki/Ella_Langley

    Elizabeth Camille Langley [1] (born May 3, 1999), [2] known professionally as Ella Langley, is an American country music singer-songwriter from Hope Hull, Alabama signed to Sony Music Nashville and Columbia Records.

  8. Wind triangle - Wikipedia

    en.wikipedia.org/wiki/Wind_triangle

    The ground vector represents the motion of the aircraft over the ground. It is described by ground track and ground speed. The ground vector is the resultant of algebraically adding the air vector and the wind vector. The wind triangle describes the relationships among the quantities used in air navigation. When two of the three vectors, or ...

  9. Data Disappeared

    highline.huffingtonpost.com/article/disappearing...

    Over the past four years, the Trump administration has destroyed or distorted vast swaths of information vital to public life and safety. This is an account of the damage.