Undefined may refer to:
Mathematics
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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 diff ...
, with several related meanings
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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
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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 behavior ...
, computer code whose behavior is not specified under certain conditions
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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" or ...
, a condition where an expression does not have a correct value
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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 im ...
* Undefined, a function or variable lacking a
declaration
Declaration may refer to:
Arts, entertainment, and media Literature
* ''Declaration'' (book), a self-published electronic pamphlet by Michael Hardt and Antonio Negri
* ''The Declaration'' (novel), a 2008 children's novel by Gemma Malley
Music ...
* 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
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Undefined citizenship
Estonian citizenship law details the conditions by which a person is a citizen of Estonia. The primary law currently governing these requirements is the Citizenship Act, which came into force on 1 April 1995.
Estonia is a member state of the ...
, 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 nation ...
form of statelessness in Estonia
See also
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Null (disambiguation)
Null may refer to:
Science, technology, and mathematics Computing
*Null (SQL)
In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational database mo ...
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Void (disambiguation)
Void may refer to:
Science, engineering, and technology
* Void (astronomy), the spaces between galaxy filaments that contain no galaxies
* Void (composites), a pore that remains unoccupied in a composite material
* Void, synonym for vacuum, a ...
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Invalid (disambiguation)
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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 ...
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Definable (disambiguation)
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