•  1
    Der fragende Sokrates
    History of Philosophy and Logical Analysis 2 (1): 67-85. 1999.
  •  4
    In Ansgar Beckermann & Dominik Perler (eds.), Klassiker der Philosopie heute, Reclam. pp. 59-79. 2004.
    The paper gives an overall view of the history of the Stoa and its main achievements.
  •  29
    Did Descartes Die of Poisoning?
    Early Science and Medicine 24 (2): 142-185. 2019.
    The paper discusses the circumstances of the fatal illness and the death of René Descartes in 1650 at the French embassy in Stockholm. It considers the hitherto available evidence, in particular the main medical documents: two letters, the first written in Dutch by Descartes’ servant, Henri Schluter, the second written in Latin by the Dutch doctor Johann van Wullen. English translations of these two documents are given respectively in Appendix 1 and Appendix 3 of this paper. Other documents, let…Read more
  • Phaidon
    with Plato
    Vandenhoeck & Ruprecht. 2004.
  •  1186
    Kant’s Categorical Imperative (CI) is to be taken as a necessary and sufficient condition for any action that is permissible, i. e. not prohibited. The class of permissible actions contains actions which are allowed as well as those which are morally required. If to perform an action and to abstain from this action can be taken to be ‘practical opposites’, then an action that is morally required for, a duty, is an action whose practical opposite is prohibited, and vice versa. The class of action…Read more
  •  47
    Aristotelian Accidents
    Oxford Studies in Ancient Philosophy 16 133-159. 1998.
    I argue, firstly, that the accounts of 'accident' in Aristotle's Met. V 30 and in Top. I 5 cannot be used to elucidate each other: the Metaphysics passage tries to disentangle the uses of a Greek word, the Topics passage introduces technical terms for Aristotle's semantics. I then argue that the positive definition in Top. I 5 is to be understood in the following way: X is an accident of Y iff X belongs to Y and if there is a Z such that X can belong to Z and also not belong to Z. Thus, being wh…Read more
  •  114
    Aristotle on What Is Done in Perceiving
    Zeitschrift für Philosophische Forschung 37 (2). 1983.
    The paper discusses the active part in the process of perceiving, usually expressed by the Greek word krinein. It is argued that krinein in one of its uses means "to judge" in the sense of judging a case, i. e. deciding it. It is not used for making statements. A second meaning of the Greek word is that of discerning or discriminating, and it is this meaning that plays a central part in Aristotle's theory of perception.
  • Art. Diodorus Cronus
    In Donald M. Borchert (ed.), The Encyclopedia of Philosophy 2nd edition. vol. 3, Thomson Gale. pp. 87. 2006.
    The article discusses the biographical and doxographical evidence for Diodorus Cronus, a prominent and influential figure at the start of Hellenistic philosophy. Special emphasis is given to Diodorus’ logic, as well to his controversy with Philo the Dialectician over the truth-criteria for the conditional as to his Master argument, concerning modal notions.
  •  51
    Über eine vermeintliche Entdeckung in der Wissenschaftstheorie: Anmerkungen zu Janich/Kambartel/Mittelstraß: Wissenschaftstheorie als Wissenschaftskritik
    Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 5 (2): 308-316. 1974.
    Der Artikel enthält eine Metakritik an einer von Vertretern der 'Erlanger Schule' vorgebrachten Kritik der Wissenschaftstheorie des Kritischen Rationalismus Poppers und Alberts. Von Janich/Kambartel/Mittelstraß war behauptet worden, das bei der Frage der Begründung wissenschaftlicher Sätze auftretende Trilemma von unendlichem Regreß, Zirkelschluß und axiomatischer Grundlegung beruhe auf einem "höchst eingeschränkten Verständnis von Begründung" und könne durch den Begriff der Verteidigung bzw. Ve…Read more
  • In this paper I argue for a reading of the Phaedo which takes into account the different levels of understanding and the different intentions of the partners to the dialectical discussions. Taking as an instantiation the argument about recollection, I show that the steps leading to the conclusion of the soul’s prenatal knowledge are steps to which Socrates’ interlocutor Simmias is committed; Socrates the questioner, however, does not commit himself to the concessions elicited from his partner.
  • I discuss the "theory of recollection" in Plato's Meno (81a–86c). Socrates' comments on the "geometry lesson" (85b8–86c3) are used to support the claim that, in a Socratic dialogue, we ought to differentiate between between non-committal and committal questions (= those implying a commitment of the questioner). It is then argued that the "theory of recollection" is no Platonic doctrine: Socrates uses Pythagorean material against Meno who is acquainted with the Pythagorean tradition and whose eri…Read more
  • Diskuse o Descartově smrti pokračuje
    Filosoficky Casopis 59 297-299. 2011.
    [The discussion of Descartes’ death continues]
  • This is a collection of papers already published (spanning the years from 1976 to 1998) covering Aristotle’s logic, his theory of science, his psychology, and his Ethics. Three papers are in English, six in German. The book contains an index of proper names as well as a list of Ebert’s publications up to 2002.
  • This is a collection of papers already published (spanning the years from 1976 to 2002) covering mostly the history of philosophy, with the exception of Aristotle (papers on Aristotle are contained in vol. I). The bulk of the papers (eight) are on Plato (on the Meno, Phaedo, Republic and Sophist), two concern the Presocratics, one paper discusses the theory of sign with the Stoics, five are on modern philosophy (Descartes, Spinoza, Leibniz and Kant). Two papers are in English, the rest in German…Read more
  •  656
    The paper starts from a distinction between two terms in Aristotle: kategoroumenon and kategoria. It is argued that the job of the first is to pick out 'predicated predicates' (i.e. predicates attached to a specific subject), the job of the second is to designate 'predicable predicates' (terms which can be attached to specific subjects). It is then argued (1) that Aristotle's division of the (erroneously) so-called 'predicables' (i. e. genus, proprium, definiens, accident) is a classification of…Read more
  • G. Jäger, "NUS" in Platons Dialogen
    Philosophische Rundschau 17 266. 1970.
  •  7
    In this paper I defend the existence of a Dialectical school proper against criticisms brought forward by Klaus Döring and by Jonathan Barnes. Whereas Döring claims that there was no Dialectical school separate from the Megarians, Barnes takes issue with my claim (argued for in “Dialektiker und frühe Stoiker bei Sextus Empiricus”) that most of the reports in Sextus on the dialecticians refer to members of the Dialectical school. Barnes contends that these dialecticians are in fact Stoic logician…Read more
  •  338
    IMMORTALITAS oder IMMATERIALITAS? Zum Untertitel von Descartes' Meditationen
    Archiv für Geschichte der Philosophie 74 (2): 180-202. 1992.
    This paper discusses the question why the first edition of Descartes' Meditations carries a title announcing a proof of the immortality of the soul, whereas Descartes himself (in the Synopsis as well as in his Replies) explicitly denies any intention to deliver such a proof. In the first part of the paper, I refute existing attempts to explain this inconsistency. In the second part, I argue that it was Descartes' intention to announce a proof for the immaterialitas, not for the immortalitas of t…Read more
  •  2
    In this paper, I take my start from certain distinctions Aristotle made use of in his analysis of prudence (phronesis) in the Nicomachean Ethics, but I then move away from Aristotle’s claims, in particular because I find fault with Aristotle’s exclusion of technical achievements from the realm of prudence. It is not the type of action which serves as a criterion to differentiate prudent acts from merely skilful ones, since in building a house you may act skilfully as well as prudently; yet where…Read more
  • Le syllogisme parfait selon Aristote
    Kairos (Université de Toulouse-Le Mirail. Faculté de philosophie) 9. 1997.
    This is a French translation (with certain alterations) of my paper of 1995 on the question of the perfect syllogism.
  • Menon (edited book)
    De Gruyter. 2019.
  • Meinung und Wissen in der Philosopbie Platons. Untersuchungen zum Charmides, Menon und Staat
    Zeitschrift für Philosophische Forschung 32 (1): 142-145. 1978.
  •  29
    Michael Wolff über Beweise für vollkommene Syllogismen bei Aristoteles
    Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 41 (1). 2010.
    The paper rejects Michael Wolff's claim that Aristotle offers proofs for the validity of his perfect syllogisms.
  •  12
    Michael Wolff über Kant als Logiker. Eine Stellungnahme zu Wolffs Metakritik
    Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 41 (2). 2010.
    In an earlier article (see J Gen Philos Sci (2009) 40: 357-372) I have discussed the arguments brought forward by Michael Wolff against the interpretation given in the commentary by Ebert and Nortmann on Aristotle's syllogistic theory (Aristoteles Analytica Priora Buch I, übersetzt und erläutert von Theodor Ebert und Ulrich Nortmann. Berlin 2007) and against the critique of Kant's adaption of the syllogistic logic. I have dealt with Wolff's arguments concerning (Ebert/Nortmann's interpretation o…Read more
  •  1
    Pythagoras and the Pythagoreans. A Brief History (review)
    Zeitschrift für Philosophische Forschung 56 (3). 2002.
    Kahn tries to do justice to the contribution Pythagoras and his followers might have had for Greek science. Thus he downplays the religious figure so prominent with Burkert's groundbreaking study "Lore and Science". He sees the transformation Pythagorean ideas may have undergone in Plato's Academy as pivotal for the developments of Pythagoreanism in later antiquity as well as in Renaissance speculation, e. g. Kepler. The book offers a good overview for the history of Pythagoreanism from its foun…Read more
  • Platon über den Wert der Wahrnehmung.
    In Christof Rapp & Tim Wagner (eds.), Wissen und Bildung in der antiken Philosophie., Metzler. 2006.
    This paper discusses passages in Plato’s Phaedo which seem to contradict each other: at Phaedo 65a-d and at 66e-67a Plato seems to rule out that sense perception can be of any help in the acquisition of knowledge, whereas at Phaedo 74b-75a it is claimed that we get our knowledge of (the form of) equality only via the perception of equal things. I argue that the incompatibility of these passages is only apparent since in the first group of texts (all taken from Socrates’ so-called apology) Socra…Read more
  •  105
    It is argued that recollection in Plato's "Meno" is used as a metaphor, though not one for a priori knowledge: the point of comparison is the analogy between the processes of learning in the sense of coming to know from an error and recollecting something one has forgotten. Recollecting in this sense as well as correcting an error implies the becoming aware of a lack of knowledge previously unnoticed. It is shown that the geometry lesson (82b9-85b7) is intended to bring out this analogy. It is a…Read more
  •  56
    Praxis und Poiesis. Zu einer handlungstheoretischen Unterscheidung des Aristoteles
    Zeitschrift für Philosophische Forschung 30 (1). 1976.
    I try to show that Aristotle does not restrict 'praxis' to those activities which have their end in themselves. NE VI 5, 1140b6-7 need not to be taken as an argument in favour of the restricted interpretation: the wording of the passage is compatible with the interpretation that the end of a praxis is (another) praxis (e.g. eupraxia), the end of a poiesis on the other hand is never a poiesis. This interpretation fits better the use of 'praxis' throughout the NE. MM A 34, 1197a4-12 is discarded s…Read more