WOLFRAM

is a symbol that represents a quantity with no defined value.

Details

Examples

Basic Examples  (2)Summary of the most common use cases

ConditionalExpression with False condition evaluates to Undefined:

Out[1]=1

The number of solutions depends on the value of x:

Out[1]=1

For x=1 only the first solution is defined:

Out[2]=2

Mathematical expressions containing Undefined evaluate to Undefined:

Out[3]=3
Wolfram Research (2010), Undefined, Wolfram Language function, https://reference.wolfram.com/language/ref/Undefined.html.
Wolfram Research (2010), Undefined, Wolfram Language function, https://reference.wolfram.com/language/ref/Undefined.html.

Text

Wolfram Research (2010), Undefined, Wolfram Language function, https://reference.wolfram.com/language/ref/Undefined.html.

Wolfram Research (2010), Undefined, Wolfram Language function, https://reference.wolfram.com/language/ref/Undefined.html.

CMS

Wolfram Language. 2010. "Undefined." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Undefined.html.

Wolfram Language. 2010. "Undefined." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Undefined.html.

APA

Wolfram Language. (2010). Undefined. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Undefined.html

Wolfram Language. (2010). Undefined. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Undefined.html

BibTeX

@misc{reference.wolfram_2025_undefined, author="Wolfram Research", title="{Undefined}", year="2010", howpublished="\url{https://reference.wolfram.com/language/ref/Undefined.html}", note=[Accessed: 13-May-2025 ]}

@misc{reference.wolfram_2025_undefined, author="Wolfram Research", title="{Undefined}", year="2010", howpublished="\url{https://reference.wolfram.com/language/ref/Undefined.html}", note=[Accessed: 13-May-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_undefined, organization={Wolfram Research}, title={Undefined}, year={2010}, url={https://reference.wolfram.com/language/ref/Undefined.html}, note=[Accessed: 13-May-2025 ]}

@online{reference.wolfram_2025_undefined, organization={Wolfram Research}, title={Undefined}, year={2010}, url={https://reference.wolfram.com/language/ref/Undefined.html}, note=[Accessed: 13-May-2025 ]}