Time Travel Time travel is commonly defined with David Lewis’ definition: An object time travels if and only if the difference between its departure and arrival times as measured in the surrounding world does not equal the duration of the journey undergone by the object. Par exemple, Jane is a time traveler if she travels away from home in her spaceship for one hour as

Bernard Lonergan (1904—1984) When we try to reconcile opposing moral opinions we usually appeal to shared ethical principles. Yet often enough the principles themselves are opposed. We may then try to reconcile opposing principles by clarifying how we arrived at them. But since most of our principles are cultural inheritances, discussions halt at a tolerant mutual respect, even when we remain convinced that the other

Jean-François Lyotard (1924-1998) Philosophe post-structuraliste français, surtout connu pour sa formulation très influente du postmodernisme dans The Postmodern Condition. Malgré sa popularité, cependant, ce livre est en fait l'une de ses œuvres les plus mineures. Les écrits de Lyotard couvrent un large éventail de sujets en philosophie, politique, et esthétique, et expérimentez une grande variété de styles. Ses œuvres peuvent être grossièrement divisées en trois catégories: tôt

Justus Lipsius (1547—1606) Justus Lipsius, a Belgian classical philologist and Humanist, wrote a series of works designed to revive ancient Stoicism in a form that would be compatible with Christianity. The most famous of these is De Constantia (‘On Constancy’) in which he advocated a Stoic-inspired ideal of constancy in the face of unpleasant external events, but also carefully distinguished those parts of Stoic philosophy

Ethics of Artificial Intelligence This article provides a comprehensive overview of the main ethical issues related to the impact of Artificial Intelligence (AI) on human society. AI is the use of machines to do things that would normally require human intelligence. In many areas of human life, AI has rapidly and significantly affected human society and the ways we interact with each other. It will

Epistemic Circularity An epistemically circular argument defends the reliability of a source of belief by relying on premises that are themselves based on the source. It is a widely shared intuition that there is something wrong with epistemically circular arguments. William Alston, who first used the term in this sense, argues plausibly that there is no way to know or to be justified in believing