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  2. Raising and lowering indices - Wikipedia

    en.wikipedia.org/wiki/Raising_and_lowering_indices

    We first fix definitions: is a finite-dimensional vector space over a field . Typically K = R {\displaystyle K=\mathbb {R} } or C {\displaystyle \mathbb {C} } . ϕ {\displaystyle \phi } is a non-degenerate bilinear form, that is, ϕ : V × V → K {\displaystyle \phi :V\times V\rightarrow K} is a map which is linear in both arguments, making it ...

  3. Index notation - Wikipedia

    en.wikipedia.org/wiki/Index_notation

    A vector treated as an array of numbers by writing as a row vector or column vector (whichever is used depends on convenience or context): = (), = Index notation allows indication of the elements of the array by simply writing a i, where the index i is known to run from 1 to n, because of n-dimensions. [1]

  4. Lists of mathematics topics - Wikipedia

    en.wikipedia.org/wiki/Lists_of_mathematics_topics

    Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions. German mathematician Carl Friedrich Gauss said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics." Number theory also studies the natural, or whole, numbers.

  5. Vector field - Wikipedia

    en.wikipedia.org/wiki/Vector_field

    The index of a vector field is an integer that helps describe its behaviour around an isolated zero (i.e., an isolated singularity of the field). In the plane, the index takes the value −1 at a saddle singularity but +1 at a source or sink singularity. Let n be the dimension of the manifold on which the vector field is defined. Take a closed ...

  6. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    refractive index: unitless principal quantum number: unitless amount of substance: mole: power: watt (W) active power (real power) watt (W) probability: unitless momentum: kilogram meter per second (kg⋅m/s) pressure: pascal (Pa) electric charge: coulomb (C) heat: joule (J) Reactive Power

  7. Index set - Wikipedia

    en.wikipedia.org/wiki/Index_set

    In mathematics, an index set is a set whose members label (or index) members of another set. [ 1 ] [ 2 ] For instance, if the elements of a set A may be indexed or labeled by means of the elements of a set J , then J is an index set.

  8. Einstein notation - Wikipedia

    en.wikipedia.org/wiki/Einstein_notation

    In mathematics, especially the usage of linear algebra in mathematical physics and differential geometry, Einstein notation (also known as the Einstein summation convention or Einstein summation notation) is a notational convention that implies summation over a set of indexed terms in a formula, thus achieving brevity.

  9. Multi-index notation - Wikipedia

    en.wikipedia.org/wiki/Multi-index_notation

    Multi-index notation is a mathematical notation that simplifies formulas used in multivariable calculus, partial differential equations and the theory of distributions, by generalising the concept of an integer index to an ordered tuple of indices.

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