RésuméLa responsabilité individuelle de l'homme est une notion centrale en théologie musulmane. Or une justification rationnelle de notre responsabilité morale présuppose que nos actes sont d'une certaine manière sous notre contrôle. Pour les théologiens, il était donc important de formuler une théorie de l'acte humain qui tienne compte de l'autodétermination humaine. Cet article analyse les réflexions d'al-Bāqillānī au sujet de l'acte humain dans le contexte des discussions qui eurent lieu en son temps. Je récapitulerai brièvement la théorie muʿtazilite du libre (...) arbitre, théorie à laquelle s'opposa l’école ašʿarite en formulant sa propre position. Ensuite, j'esquisserai les fondements du point de vue d'Abū al-Ḥasan al-Ašʿarī qui proposa de fonder l'autodétermination humaine sur le caractère volontaire de l'acte humain. Finalement, je discuterai comment al-Bāqillānī développe sa théorie en partant des idées d'al-Ašʿarī. Sur la base des volumes préservés de la Hidāyat al-mustaršidīn d'al-Bāqillānī, j'argumenterai qu'il envisage de donner plus de cohérence à la célèbre théorie de l’ “acquisition” en soutenant deux principes: a) l'acte humain est créé par Dieu; b) il existe cependant une corrélation réelle entre l'homme et son acte “acquis”. (shrink)

This paper presents a unique manuscript copy of a fifth/eleventh-century Maghribī commentary on al-Bāqillānī’s Kitāb al-Tamhīd. The work, entitled al-Tasdīd fī sharḥ al-Tamhīd, was written by ‘Abd al-Jalīl b. Abī Bakr al-Dībājī —also known as Ibn al-Ṣābūnī— who had studied the Kitāb al-Tamhīd with al-Bāqillānī’s disciples in Qayrawān. The present study first reviews the transmission of al-Bāqillānī’s work to the Islamic west. It then continues to present the author of the commentary, to reconstruct the work’s genesis and to describe its (...) content. The final section focuses on a sample chapter and argues that al-Dībājī follows al-Bāqillānī’s later position on a specific theory —the so-called theory ofaḥwāl— of which the Tamhīd strongly disapproved. The Tasdīd is one of the oldest texts of Maghribī Ash‘arism that has come down to us and provides valuable new insights into the school’s early history in the Islamic west. (shrink)

In 1783 John Michell published a note entitled ‘On the Means of Discovering the Distance, Magnitude etc. of the Fixed Stars, in Consequence of the Diminution of the Velocity of their Light’, but it was Christian Doppler who in 1842 for the first time formulated the principle : If a source of sound or light is in motion relative to an observer, or an observer in motion relative to a source, the period of the waves received by the observer will (...) be different from the period of the waves emitted by the source. The acoustical Doppler principle was verified in 1845 by Buys-Ballot's experiments and by Ernst Mach ). H. Fizeau proposed to verify the optical Doppler principle by measuring the shift of lines in the spectra of stars . This was carried out by William Huggins , and H. C. Vogel and led to exact results in 1892. The Doppler effect with canal rays was shown by Johannes Stark in 1905. (shrink)

Philosophical Theology in Islam explores the later history of the Ashʿarī school of theology through in-depth studies on its thought, sources, scholarly networks and contexts.

The work of the Bohemian chemist Franz Wald seems to be unknown in the history of science. In this paper some of Wald's these concerning the foundation of chemical theory are discussed in connexion with reflexions given in unpublished letters, which Wald wrote to Ernst Mach during the years 1896–1907.

This book offers an account of the life and thought of al-Ḥasan ar-Raṣṣāṣ , who was among the most influential theologians of Yemeni Zaydism. Dieses Buch untersucht Leben und Denken von al-Ḥasan ar-Raṣṣāṣ , einem der einflussreichsten Theologen der jemenitischen Zaydiyya.