Lacan is an influential figure of 20th Century thought. Being a psychoanalyst, a linguist and at the same time a philosopher, in his theory he combines all three of these disciplines. Even in his later works, he tried to combine his theory with mathematical formalization. His theory influenced three important political thinkers: Laclau, &amp / #381 / i&amp / #382 / ek and Badiou. The purpose of this dissertation is mainly to examine Lacan&rsquo / s thought and its impasses which could be found especially in the political applications of his theory. First I start with a critical reading of Lacan&rsquo / s own works. I try to figure out the idealizations, presuppositions and blind spots hidden in his work. I develop my critical reading by focusing on the works of Laclau, &amp / #381 / i&amp / #382 / ek and Badiou. The main argument of this dissertation is, such a critical reading of these philosophers will lead us to a general questioning of Lacan&rsquo / s theory and the legitimacy of its applications. Lacan&rsquo / s use of the impossibility as a founding principle and his passion for formalization cause several idealizations, like the idealization of the neutrality of the signifier, the idealization of the non-represented and so on. These problems are extended and transformed into other ones in his disciples&rsquo / works. For Laclau, the problem is transformed into a purely content-free understanding of elements of democracy which ends up with paradoxical results. For &amp / #381 / i&amp / #382 / ek and Badiou, because of their insistence on a political theory based on the impossible real, their subversive theories end up with a theory which take the form of messianic discourses. What I propose is a reconsideration of the role of the theory on the understanding of human reality: in principle every theory excludes some portions of the richness of human life-world, therefore every theory must have a retrospective and critical stance against its own founding principles. This cannot be done by formalized theories which keep the formal structure of itself untouchable.

The philosophical problem of the tension between liberty and order has dominated the agenda of western philosophy and science since the beginning of the history of thought, and it is a leading issue nowadays, too. The problem of the act of decision is particularly one of the significant themes of contemporary political thought. Instead of the classical poles of both voluntarism and determinism prioritising either the subject or the structure, what should be employed is a much deeper analysis of the relation between undecidability and the act of decision. In this respect, the discussion between Ernesto Laclau and Slavoj &amp / #381 / i&amp / #382 / ek is considerably illuminating. But there are also theoretical shortcomings shared by these thinkers. That is, despite the informativeness of this debate, there is an overwhelming necessity to critically assess this dialogue with a particular emphasis on the conceptual issues. In this regard, an overall scrutiny and critical assessment of this debate constitute the main body of this thesis.

Die Bibliotheca Corviniana, die vielgerühmte Bibliothek des Königs Matthias Corvinus von Ungarn (1443-1490), umfasste einst in Buda 2000 bis 2500 Bände mit 4000 bis 5000 antiken, mittelalterlichen und humanistischen Werken. Sie war eine der bedeutendsten fürstichen Büchersammlungen der Renaissance...

Die Bibliotheca Corviniana, die vielgerühmte Bibliothek des Königs Matthias Corvinus von Ungarn (1443-1490), umfasste einst in Buda 2000 bis 2500 Bände mit 4000 bis 5000 antiken, mittelalterlichen und humanistischen Werken. Sie war eine der bedeutendsten fürstichen Büchersammlungen der Renaissance...