Alireza Norouzi; seyed mojtaba mirdamadi
Abstract
The principle of contradiction in the three domains of epistemology, philosophy and logic is of incomparable importance, and it is necessary to examine the conditions of its realization in order to know the cases of its flow. Among the conditions of contradiction are the unity that must be maintained ...
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The principle of contradiction in the three domains of epistemology, philosophy and logic is of incomparable importance, and it is necessary to examine the conditions of its realization in order to know the cases of its flow. Among the conditions of contradiction are the unity that must be maintained in two contradictory propositions. There has always been a difference between logicians in detailing the conditions and the number of unity conditions. The famous opinion, the requirement of eight unity is contradictory, but thinkers have always tried to correct this opinion, in such a way that they either added conditions to it or reduced the famous conditions to fewer cases. The present research, with the method of conceptual, propositional, and systemic analysis, examines the conditions mentioned in logic books and concludes that all these conditions are reduced to two conditions: "the unity of the subject" and "the unity of the predicate". In the second part, according to the late philosophy of Wittgenstein, it is proved that in the unity of contradiction, another condition is necessary that is not mentioned in any of the books of the predecessors and on the other hand, it is not an example of any of the aforementioned conditions, and that is the phrase From "unity of language".
