 Apart from geometry, Kant, himself, actually didn’t focus much on the case of mathematics. But, as mathematics in the 19th C. began reaching new heights of sophistication, worries were increasingly raised about its foundations. It was specifically in response to these latter worries that Gottlob Frege (1884 [1980]) tried to improve upon Kant’s formulations of the analytic, and presented what is widely regarded as the next significant discussion of the  topic.[3]