Reciprocal function
This article is about a particular function from a subset of the real numbers to the real numbers. Information about the function, including its domain, range, and key data relating to graphing, differentiation, and integration, is presented in the article.
View a complete list of particular functions on this wiki
Definition
The reciprocal function is a function defined on the set of nonzero reals, that sends every real number to its reciprocal, i.e., its multiplicative inverse. Explicitly, it is the function:
Key data
Item | Value |
---|---|
default domain | all nonzero real numbers, i.e., , which can also be written as . |
range | all nonzero real numbers, i.e., , which can also be written as . |
inverse function | the reciprocal function itself. In other words, this function equals its own inverse. Another way of putting this is that the reciprocal of the reciprocal of a number is the original number. |
local minimum values and points of attainment | no local minimum values |
local maximum values and points of attainment | no local maximum values |
horizontal asymptotes | The -axis () is a horizontal asymptote both as (with approach from below) and as (with approach from above). |
vertical asymptotes | The -axis () is a vertical asymptote from both left (i.e., as , ) and right (i.e., as , ). |
first derivative | |
second derivative | |
higher derivatives | The derivative is |
first antiderivative | where is the natural logarithm. Note that the value is constant in and also constant in , but the constant values could differ between these two intervals. |