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  2. Frequency - Wikipedia

    en.wikipedia.org/wiki/Frequency

    A pendulum with a period of 2.8 s and a frequency of 0.36 Hz. For cyclical phenomena such as oscillations, waves, or for examples of simple harmonic motion, the term frequency is defined as the number of cycles or repetitions per unit of time.

  3. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    This glossary of physics is a list of definitions of terms and concepts ... Glossary of areas of mathematics, ... so it is equal to gauge pressure plus atmospheric ...

  4. Section sign - Wikipedia

    en.wikipedia.org/wiki/Section_sign

    The section sign is often used when referring to a specific section of a legal code. For example, in Bluebook style, "Title 16 of the United States Code Section 580p" becomes "16 U.S.C. § 580p". [4] The section sign is frequently used along with the pilcrow (or paragraph sign), ¶, to reference a specific paragraph within a section of a document.

  5. Function (mathematics) - Wikipedia

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

    If the domain of definition equals X, one often says that the partial function is a total function. In several areas of mathematics the term "function" refers to partial functions rather than to ordinary functions. This is typically the case when functions may be specified in a way that makes difficult or even impossible to determine their domain.

  6. Sign function - Wikipedia

    en.wikipedia.org/wiki/Sign_function

    Signum function = ⁡. In mathematics, the sign function or signum function (from signum, Latin for "sign") is a function that has the value −1, +1 or 0 according to whether the sign of a given real number is positive or negative, or the given number is itself zero.

  7. Square root - Wikipedia

    en.wikipedia.org/wiki/Square_root

    Notation for the (principal) square root of x. For example, √ 25 = 5, since 25 = 5 ⋅ 5, or 5 2 (5 squared). In mathematics, a square root of a number x is a number y such that =; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. [1]

  8. Mathematical notation - Wikipedia

    en.wikipedia.org/wiki/Mathematical_notation

    It is widely used in mathematics, through its extension called LaTeX, and is a de facto standard. (The above expression is written in LaTeX.) (The above expression is written in LaTeX.) More recently, another approach for mathematical typesetting is provided by MathML .

  9. Glossary of general topology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_topology

    Absolutely closed See H-closed Accessible See . Accumulation point See limit point. Alexandrov topology The topology of a space X is an Alexandrov topology (or is finitely generated) if arbitrary intersections of open sets in X are open, or equivalently, if arbitrary unions of closed sets are closed, or, again equivalently, if the open sets are the upper sets of a poset.