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2. Feigenbaum constants - Wikipedia

   en.wikipedia.org/wiki/Feigenbaum_constants

   To see how this number arises, consider the real one-parameter map =.Here a is the bifurcation parameter, x is the variable. The values of a for which the period doubles (e.g. the largest value for a with no period-2 orbit, or the largest a with no period-4 orbit), are a 1, a 2 etc.

3. List of mathematical abbreviations - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical...

   pdf – probability density function. pf – proof. PGL – projective general linear group. Pin – pin group. pmf – probability mass function. Pn – previous number. Pr – probability of an event. (See Probability theory. Also written as P or.) probit – probit function. PRNG – pseudorandom number generator.

4. Dirac delta function - Wikipedia

   en.wikipedia.org/wiki/Dirac_delta_function

   In mathematical analysis, the Dirac delta function (or δ distribution), also known as the unit impulse, [1] is a generalized function on the real numbers, whose value is zero everywhere except at zero, and whose integral over the entire real line is equal to one.

5. Interval contractor - Wikipedia

   en.wikipedia.org/wiki/Interval_contractor

   There exist different ways to build contractors associated to equations and inequalities, say, f(x) in [y]. Most of them are based on interval arithmetic. One of the most efficient and most simple is the forward/backward contractor (also called as HC4-revise). [3] [4] The principle is to evaluate f(x) using interval arithmetic (this is the ...

6. Kronecker delta - Wikipedia

   en.wikipedia.org/wiki/Kronecker_delta

   In mathematics, the Kronecker delta (named after Leopold Kronecker) is a function of two variables, usually just non-negative integers.The function is 1 if the variables are equal, and 0 otherwise: = {, =. or with use of Iverson brackets: = [=] For example, = because , whereas = because =.

7. Special functions - Wikipedia

   en.wikipedia.org/wiki/Special_functions

   Many special functions appear as solutions of differential equations or integrals of elementary functions.Therefore, tables of integrals [1] usually include descriptions of special functions, and tables of special functions [2] include most important integrals; at least, the integral representation of special functions.