Bolzano was convinced that among the true propositions, there is a fundamental relation of consecutivity according to which some of them are ground or reason of others, which are then consequences of them, and he tried to determine the formal-logical aspects of this relation. He also reduced to it the causality relation by considering that the phenomenon x is cause of the phenomenon y if and only if the proposition that attributes existence to x has among its consequences the proposition that attributes existence to y. In this context also, the alethic modalities find their treatment.
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