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Given a complex number z, there is not a unique complex number w satisfying erf w = z, so a true inverse function would be multivalued. However, for −1 < x < 1, there is a unique real number denoted erf −1 x satisfying () =.
In real estate, an erf (pl. erven) is the legal term used in Namibia, South Africa and Eswatini to describe a piece of land registered in a deeds registry as an erf, lot, plot or stand. The term is of Afrikaans origin. Section 102 of the South African Deeds Registries Act, 1937 [1] provides the following definition:
The ERF method of finding a particular solution of a non-homogeneous differential equation is applicable if the non-homogeneous equation is or could be transformed to form () = + + +; where , are real or complex numbers and () is homogeneous linear differential equation of any order. Then, the exponential response formula can be applied to each ...
Erf (law), in real estate law Erf (river), in Germany Estuarine Research Federation, an American environmental organization; Erfurt-Weimar Airport, in Germany (IATA code) ...
The article claims that erf/erfc exist in GNU libc, but aren't part of any standard. I've come across references that claimed erf/erfc are part of the C99 ISO standard. —Preceding unsigned comment added by 87.174.73.108 23:43, 11 March 2008 (UTC) Yes, indeed they are functions in <math.h> in C99.
The Employer Identification Number (EIN), also known as the Federal Employer Identification Number (FEIN) or the Federal Tax Identification Number (FTIN), is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to business entities operating in the United States for the purposes of identification.
ERF was a British truck manufacturer established in 1933 by Edwin Richard Foden, from whose initials the company was named. Its factory in Middlewich closed in 2002, and it was discontinued as a marque by owner MAN in 2007.
Aside from their empirical performance, activation functions also have different mathematical properties: Nonlinear When the activation function is non-linear, then a two-layer neural network can be proven to be a universal function approximator. [6]