Undefined may refer to:
Mathematics
*
Undefined (mathematics)
In mathematics, the term undefined is often used to refer to an expression which is not assigned an interpretation or a value (such as an indeterminate form, which has the propensity of assuming different values). The term can take on several dif ...
, with several related meanings
**
Indeterminate form
In calculus and other branches of mathematical analysis, limits involving an algebraic combination of functions in an independent variable may often be evaluated by replacing these functions by their limits; if the expression obtained after this s ...
, in calculus
Computing
*
Undefined behavior
In computer programming, undefined behavior (UB) is the result of executing a program whose behavior is prescribed to be unpredictable, in the language specification to which the computer code adheres. This is different from unspecified behavio ...
, computer code whose behavior is not specified under certain conditions
*
Undefined value
In computing (particularly, in programming), undefined value is a condition where an expression does not have a correct value, although it is syntactically correct. An undefined value must not be confused with empty string, Boolean "false" o ...
, a condition where an expression does not have a correct value
*
Undefined variable An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code."undefined variable." YourDictionary, n.d. Web. 24 July 2013. .
In some programming languages, an impl ...
* Undefined, a function or variable lacking a
declaration
* Undefined, a variable lacking
initialization
* Undefined, an unavailable
linker
Linker or linkers may refer to:
Computing
* Linker (computing), a computer program that takes one or more object files generated by a compiler or generated by an assembler and links them with libraries, generating an executable program or shar ...
symbol (function, or global variable)
Other uses
* Undefined, something that lacks any
definition
A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories: intensional definitions (which try to give the sense of a term), and extensional definitio ...
*
Undefined citizenship, a post-
Soviet
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...
form of statelessness in Estonia
See also
*
Null (disambiguation)
*
Void (disambiguation)
*
Invalid (disambiguation)
Invalid may refer to:
* Patient, a sick person
* one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term)
* .invalid, a top-level Internet domain not intended for real use
As ...
*
Definition (disambiguation)
A definition is a statement of the meaning of a term.
Definition may also refer to:
Science, mathematics and computing
* In computer programming languages, a declaration that reserves memory for a variable or gives the body of a subroutine
* D ...
*
Definable (disambiguation)
In mathematical logic, the word definable may refer to:
* A definable real number
* A definable set In mathematical logic, a definable set is an ''n''-ary relation on the domain of a structure whose elements satisfy some formula in the first-ord ...
*
{{disambiguation