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A sigmoid function is any mathematical function whose graph has a characteristic S-shaped or sigmoid curve. A common example of a sigmoid function is the logistic function, which is defined by the formula: [1] = + = + = ().
Divisor function σ 0 (n) up to n = 250 Sigma function σ 1 (n) up to n = 250 Sum of the squares of divisors, σ 2 (n), up to n = 250 Sum of cubes of divisors, σ 3 (n) up to n = 250. In mathematics, and specifically in number theory, a divisor function is an arithmetic function related to the divisors of an integer.
In mathematics, by sigma function one can mean one of the following: The sum-of-divisors function σ a (n), an arithmetic function; Weierstrass sigma function, related to elliptic functions; Rado's sigma function, see busy beaver; See also sigmoid function
The Weierstrass sigma function associated to a two-dimensional lattice ...
This template displays the Greek letter sigma for use in mathematical equations. Template parameters [Edit template data] Parameter Description Type Status Uppercase uc uppercase Whether or not the character displayed is uppercase. Unknown optional No italic noitalic Whether or not the character displayed is not italic. Unknown optional var var Whether to use the variation of the character for ...
one of the Gegenbauer functions in analytic number theory (may be replaced by the capital form of the Latin letter P). represents: one of the Gegenbauer functions in analytic number theory. the Dickman–de Bruijn function; the radius in a polar, cylindrical, or spherical coordinate system; the correlation coefficient in statistics
In mathematics, the Weil pairing is a pairing (bilinear form, though with multiplicative notation) on the points of order dividing n of an elliptic curve E, taking values in nth roots of unity.
Spaces within a formula must be directly managed (for example by including explicit hair or thin spaces). Variable names must be italicized explicitly, and superscripts and subscripts must use an explicit tag or template. Except for short formulas, the source of a formula typically has more markup overhead and can be difficult to read.