
Not 
Details

- Not[expr] can be input in StandardForm and InputForm as ¬expr. The character
can be entered as
!
,
not
, or ∖[Not]. »
- Not gives symbolic results when necessary, applying various simplification rules to them.
- If you are using the Wolfram System with a text‐based front end, then you cannot use the notation !expr for Not[expr] if it appears at the very beginning of a line. In this case, !expr is interpreted as a shell escape. »
Examples
open all close allScope (4)
Double negation simplifies to the identity:
Negate equations and inequalities:
TraditionalForm formatting:
Applications (2)
Properties & Relations (4)
Tech Notes
Related Guides
History
Introduced in 1988 (1.0) | Updated in 1996 (3.0)
Text
Wolfram Research (1988), Not, Wolfram Language function, https://reference.wolfram.com/language/ref/Not.html (updated 1996).
CMS
Wolfram Language. 1988. "Not." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 1996. https://reference.wolfram.com/language/ref/Not.html.
APA
Wolfram Language. (1988). Not. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Not.html
BibTeX
@misc{reference.wolfram_2025_not, author="Wolfram Research", title="{Not}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/Not.html}", note=[Accessed: 08-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_not, organization={Wolfram Research}, title={Not}, year={1996}, url={https://reference.wolfram.com/language/ref/Not.html}, note=[Accessed: 08-August-2025]}