In this chapter, the reconstruction of Bolzano’s theory of lectological entities is enriched, taking into account that even such entities are objects and so there are ideas (called ‘symbolic’) referring to them, qualities belonging to them, and propositions attributing such qualities to them. By means of such ideas, it becomes possible to treat relations among aggregates of ideas and propositions. Moreover, the prima facie amazing Bolzano’s Conjecture, according to which all true propositions have the form ‘A has b’, is analysed and discussed at length.
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