In this chapter, the Bolzanian system of inferences, i.e. of propositions asserting the subsistence of the relation of derivability among other propositions, is developed in detail. A particularly interesting and noteworthy trait of the method adopted by Bolzano in this treatment is that this method is not an axiomatic one, but proceeds as the production of a catalogue, ordered according to the old principle: from the simpler to the more complex.
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