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  2. Nabla symbol - Wikipedia

    en.wikipedia.org/wiki/Nabla_symbol

    The nabla symbol. The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait. [2] [4] [5] [6] [7]

  3. Neighbourhood (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Neighbourhood_(mathematics)

    Neighbourhood (mathematics) In topology and related areas of mathematics, a neighbourhood (or neighborhood) is one of the basic concepts in a topological space. It is closely related to the concepts of open set and interior. Intuitively speaking, a neighbourhood of a point is a set of points containing that point where one can move some amount ...

  4. ΔP - Wikipedia

    en.wikipedia.org/wiki/ΔP

    Lung compliance. In general, compliance is defined by the change in volume (Δ V) versus the associated change in pressure (Δ P ), or Δ V /Δ P : During mechanical ventilation, compliance is influenced by three main physiologic factors: Lung compliance is influenced by a variety of primary abnormalities of lung parenchyma, both chronic and acute.

  5. Delta Sigma Theta - Wikipedia

    en.wikipedia.org/wiki/Delta_Sigma_Theta

    Delta Sigma Theta Sorority, Inc. ( ΔΣΘ) is a historically African American sorority. The organization was founded by college-educated women dedicated to public service with an emphasis on programs that assist the African American community. Delta Sigma Theta was founded on January 13, 1913 by twenty-two women at Howard University in ...

  6. Integral symbol - Wikipedia

    en.wikipedia.org/wiki/Integral_symbol

    The integral symbol is U+222B ∫ INTEGRAL in Unicode [5] and \int in LaTeX. In HTML, it is written as ∫ ( hexadecimal ), ∫ ( decimal) and ∫ ( named entity ). The original IBM PC code page 437 character set included a couple of characters ⌠ and ⌡ (codes 244 and 245 respectively) to build the integral symbol.

  7. Dirac comb - Wikipedia

    en.wikipedia.org/wiki/Dirac_comb

    Dirac comb. In mathematics, a Dirac comb (also known as sha function, impulse train or sampling function) is a periodic function with the formula. for some given period . [1] Here t is a real variable and the sum extends over all integers k. The Dirac delta function and the Dirac comb are tempered distributions.

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