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单词 ContradictoryStatement
释义

contradictory statement


A contradictory statement is a statement (or form) which is false due to its logical form rather than because of the meaning of the terms employed.

In propositional logicPlanetmathPlanetmath, a contradictory statement, a.k.a. contradictionMathworldPlanetmath, is a statement which is false regardless of the truth values of the substatements which form it.  According to G. Peano, one may generally denote a contradiction with the symbol .

For a simple example, the statement  P¬P  is a contradiction for any statement P.

The negationMathworldPlanetmath ¬Q of every contradiction Q is a tautologyMathworldPlanetmath, and vice versa:

¬=,¬=

To test a given statement or form to see if it is a contradiction, one may construct its truth tableMathworldPlanetmath.  If it turns out that every value of the last column is “F”, then the statement is a contradiction.

Cf. the entry “contradiction (http://planetmath.org/Contradiction)”.

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更新时间:2025/5/4 12:49:54