In this essay, it will be proved that unactualized propositions, which have subjects that are impossible to exist, should be reduced to conditional propositions and their primary structures are not categorical. But on the other hand, if we want to accept “the theory of mental being”, these propositions must be considered as categorical propositions in order to be included by “the rule of subordination”. So, if we accept that unactualized propositions are categorical, the arguments for the “theory of mental being” will be denied. However, we can prove the theory by the notion of “direct knowledge”.
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