In his orientation towards mathematics and in his conception of the role mathematics has to play in philosophical investigations Maimon follows in the great tradition of the seventeenth century represented by Descartes, Spinoza, and Leibniz, a line of thought of which Kant constitutes the last link. We have seen that Maimon reinterpreted various of Leibniz’ doctrines to suit them more to his critical bent by transforming metaphysical ideas conceived by Leibniz as transcendent entities into critical ideas, that is, as methodical principles. But in his attitude towards the place of mathematics and the role it has to play in metaphysical speculations and in epistemological investigations Maimon remained a true follower of Leibniz.