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  2. Singularity (mathematics) - Wikipedia

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

    Singularity (mathematics) In mathematics, a singularity is a point at which a given mathematical object is not defined, or a point where the mathematical object ceases to be well-behaved in some particular way, such as by lacking differentiability or analyticity. [1][2][3] For example, the reciprocal function has a singularity at , where the ...

  3. Singular function - Wikipedia

    en.wikipedia.org/wiki/Singular_function

    In mathematics, a real-valued function f on the interval [a, b] is said to be singular if it has the following properties: f is continuous on [a, b]. (**) there exists a set N of measure 0 such that for all x outside of N the derivative f ′ (x) exists and is zero, that is, the derivative of f vanishes almost everywhere. f is non-constant on ...

  4. Singularity function - Wikipedia

    en.wikipedia.org/wiki/Singularity_function

    Singularity function. Singularity functions are a class of discontinuous functions that contain singularities, i.e., they are discontinuous at their singular points. Singularity functions have been heavily studied in the field of mathematics under the alternative names of generalized functions and distribution theory. [1][2][3] The functions ...

  5. Milnor number - Wikipedia

    en.wikipedia.org/wiki/Milnor_number

    Milnor number. In mathematics, and particularly singularity theory, the Milnor number, named after John Milnor, is an invariant of a function germ. If f is a complex-valued holomorphic function germ then the Milnor number of f, denoted μ (f), is either a nonnegative integer, or is infinite. It can be considered both a geometric invariant and ...

  6. Singular solution - Wikipedia

    en.wikipedia.org/wiki/Singular_solution

    Singular solution. A singular solution ys (x) of an ordinary differential equation is a solution that is singular or one for which the initial value problem (also called the Cauchy problem by some authors) fails to have a unique solution at some point on the solution. The set on which a solution is singular may be as small as a single point or ...

  7. Cusp (singularity) - Wikipedia

    en.wikipedia.org/wiki/Cusp_(singularity)

    Cusp (singularity) A cusp at (0, 1/2) In mathematics, a cusp, sometimes called spinode in old texts, is a point on a curve where a moving point must reverse direction. A typical example is given in the figure. A cusp is thus a type of singular point of a curve. For a plane curve defined by an analytic, parametric equation.

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