Inverse
Inverse or invert may refer to:
Science, engineering and mathematics
See also
Inverse (mathematics)
In many contexts in mathematics the term inverse indicates the opposite of something. This word and its derivatives are used widely in mathematics, as illustrated below.
- the additive inverse of x is −x;
- the multiplicative inverse or reciprocal of x is x−1.
- inverse function — inverse element with respect to function composition: a function that "reverses" the action of a given function: f−1(f(x)) = x.
Inverse element
In abstract algebra, the idea of an inverse element generalises concepts of a negation (sign reversal) in relation to addition, and a reciprocal in relation to multiplication. The intuition is of an element that can 'undo' the effect of combination with another given element. While the precise definition of an inverse element varies depending on the algebraic structure involved, these definitions coincide in a group.
The word 'inverse' is derived from Latin: inversus that means 'turned upside down', 'overturned'.
Formal definitions
In a unital magma
Let 
be a set with a binary operation 
(i.e., a magma note that a magma also has closure under the binary operation). If 
is an identity element of 
(i.e., S is a unital magma) and 
, then 
is called a left inverse of 
and is called a right inverse of . If an element 
is both a left inverse and a right inverse of 
, then is called a two-sided inverse, or simply an inverse, of . An element with a two-sided inverse in is called invertible in . An element with an inverse element only on one side is left invertible, resp. right invertible. A unital magma in which all elements are invertible is called a loop. A loop whose binary operation satisfies the associative law is a group.
Drift
Art, film, and literature
Geography
Industry
Drift (telecommunication)
In telecommunication, a drift is a comparatively long-term change in an attribute, value, or operational parameter of a system or equipment. The drift should be characterized, such as "diurnal frequency drift" and "output level drift." Drift is usually undesirable and unidirectional, but may be bidirectional, cyclic, or of such long-term duration and low excursion rate as to be negligible.
Drift is also common in pseudo-synchronised streaming applications, such as low-latency audio streaming over TCP/IP. Normally both ends of a streaming connection would stay in-sync with a master clock but TCP/IP does not provide this 'master clock' mechanism. Therefore applications running fixed clocks will drift apart over time and glitches will occur. This is usually fixed by controlling jitter or drift, by slightly altering the clock speed at one end of the connection.
References
See also
Drift (film series)
The Drift (ドリフト, Dorifuto) film series consist of street racing films produced by Geneon Universal Entertainment released between 2006 to 2008. All the films are set on racing touge roads.
Film series
Drift 6 Z (2008)
Known as Drift Z on Hong Kong releases.
Drift 7 R (2008)
Known as Drift GT-R on Hong Kong releases.
Podcasts:
