law of the excluded middle


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law of the excluded middle

[¦lȯ əvthē ik‚sklüd·əd ′mid·əl]
(mathematics)
A principle of logic whereby a proposition is either true or false but cannot be both true and false. Also known as principle of dichotomy.
References in periodicals archive ?
Pierce noted that Actuals and Probables DO obey the law of the Excluded Middle, but Possibles do not.
By virtue of particular authors' status, bold assertions, and effective pedagogical techniques, the participating fuzzy logicians mostly came to agree that Elkan's proof illegitimately used the law of the excluded middle (either A or not-A is true), which does not apply within fuzzy logic.
It is not consciousness and matter that cause the problem, but rather a slavish and misguided adherence to the so-called law of the excluded middle.