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==Document history==
 
==Document history==
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Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
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* [http://mywikibiz.com/Minimal_negation_operator Minimal Negation Operator], [http://mywikibiz.com/ MyWikiBiz]
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* [http://beta.wikiversity.org/wiki/Minimal_negation_operator Minimal Negation Operator], [http://beta.wikiversity.org/ Beta Wikiversity]
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* [http://planetmath.org/encyclopedia/MinimalNegationOperator.html Minimal Negation Operator], [http://planetmath.org/ PlanetMath]
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* [http://www.proofwiki.org/wiki/Definition:Minimal_Negation_Operator Minimal Negation Operator], [http://www.proofwiki.org/ ProofWiki]
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* [http://www.getwiki.net/-Minimal_Negation_Operator Minimal Negation Operator], [http://www.getwiki.net/ GetWiki]
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* [http://www.textop.org/wiki/index.php?title=Minimal_negation_operator Minimal Negation Operator], [http://www.textop.org/wiki/ Textop Wiki]
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* [http://www.wikinfo.org/index.php/Minimal_negation_operator Minimal Negation Operator], [http://www.wikinfo.org/ Wikinfo]
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* [http://en.wikipedia.org/wiki/Minimal_negation_operator Minimal Negation Operator], [http://en.wikipedia.org/ Wikipedia]
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