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  2. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    A three-phase system may be arranged in delta (∆) or star (Y) (also denoted as wye in some areas, as symbolically it is similar to the letter 'Y'). A wye system allows the use of two different voltages from all three phases , such as a 230/400 V system which provides 230 V between the neutral (centre hub) and any one of the phases, and 400 V ...

  3. Limit of a function - Wikipedia

    en.wikipedia.org/wiki/Limit_of_a_function

    In mathematics, the limit of a function is a fundamental concept in calculus and analysis concerning the behavior of that function near a particular input which may or may not be in the domain of the function. Formal definitions, first devised in the early 19th century, are given below. Informally, a function f assigns an output f(x) to every ...

  4. Delta rule - Wikipedia

    en.wikipedia.org/wiki/Delta_rule

    In machine learning, the delta rule is a gradient descent learning rule for updating the weights of the inputs to artificial neurons in a single-layer neural network. [1]

  5. Delta set - Wikipedia

    en.wikipedia.org/wiki/Delta_set

    Formally, a Δ-set is a sequence of sets {} = together with maps : + for each and =,, …, +, that satisfy + = + whenever <.Often, the superscript of is omitted for brevity.. This definition generalizes the notion of a simplicial complex, where the are the sets of n-simplices, and the are the associated face maps, each mapping the -th face of a simplex in + to a simplex in .

  6. Gδ set - Wikipedia

    en.wikipedia.org/wiki/Gδ_set

    In the mathematical field of topology, a G δ set is a subset of a topological space that is a countable intersection of open sets.The notation originated from the German nouns Gebiet ' open set ' and Durchschnitt ' intersection '. [1]

  7. Convolution - Wikipedia

    en.wikipedia.org/wiki/Convolution

    In time-resolved fluorescence spectroscopy, the excitation signal can be treated as a chain of delta pulses, and the measured fluorescence is a sum of exponential decays from each delta pulse. In computational fluid dynamics , the large eddy simulation (LES) turbulence model uses the convolution operation to lower the range of length scales ...

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