## NOR operation

NOR operation The logical connective combining two statements, truth values, or formulas P and Q in such a way that the result is true only if both P and Q are false (see table). The NOR operation is the dual of the NAND operation (see duality). It may be represented by the Pierce arrow, ↓, or by ∇. PQ is just the negation of P Q, hence the name (see OR operation).

The NOR operation is of particular significance to computer designers since any Boolean expression can be expressed using the NOR operation alone. In practical terms, circuits can be built using only NOR gates.

Pick a style below, and copy the text for your bibliography.

• MLA
• Chicago
• APA

"NOR operation." A Dictionary of Computing. . Encyclopedia.com. 26 Mar. 2019 <https://www.encyclopedia.com>.

"NOR operation." A Dictionary of Computing. . Encyclopedia.com. (March 26, 2019). https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/nor-operation

"NOR operation." A Dictionary of Computing. . Retrieved March 26, 2019 from Encyclopedia.com: https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/nor-operation

### Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

#### Modern Language Association

http://www.mla.org/style

#### The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

#### American Psychological Association

http://apastyle.apa.org/

##### Notes:
• Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
• In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.