Transcendental philosophy and ontology of difference in Salomon Maimon

The paper aims to show the relationship between Transcendental Philosophy and the Theory of Difference in Maimon's thinking. Starting from Maimon's first letter to Kant, the author explains the questions of quid iuris? and quid fact? In a further paragraph, Maimon's theory about the Understanding (Verstand) is compared with the matching theories of Fichte and Hegel. The analysis of Maimon's "Principle of Determinability" (Grundsatz der Bestimmbarkeit) is followed by a final remark on Maimon's meaning for Deleuze's book Difference and Repetition.