[KANT] seems to think of concepts as defined … forming concepts, that is one of the least … scarcely find one that is of this description. … What we find in [mathematical definitions] is not a … connected with the others. A geometrical illustration will … [If we define an area by the intersection of existing figures,] what we do … is to use the lines already given in … the process. But the more fruitful type of … we are not simply taking out of the … our knowledge, and ought therefore, on KANT's view, … are thus analytic. The truth is that they … are contained in a house.
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