Abu Ya’qub al-Sijistani (fl. 971) Abu Ya‘qub al-Sijistani was first and foremost a member of the Ismaili underground mission — the da‘wa, as it is known in Arabic — that operated in the Iranian province of Khurasan and Sijistan during the tenth century. In the later part of his life, al-Sijistani was or had become a supporter of the Fatimids imams, then ruling from their

Dialogical Logic Dialogical logic is an approach to logic in which the meaning of the logical constants (connectives and quantifiers) and the notion of validity are explained in game-theoretic terms. The meaning of each logical constant (such as “and”, “or”, “implies”, “not”, “every”, and so forth) is given in terms of how assertions containing these logical constants can be attacked and defended in an adversarial dialogue. Dialogues are described as two-player

Anaximander (c. 610—546 B.C.E.) Anaximander was the author of the first surviving lines of Western philosophy. He speculated and argued about “the Boundless” as the origin of all that is. He also worked on the fields of what we now call geography and biology. Moreover, Anaximander was the first speculative astronomer. He originated the world-picture of the open universe, which replaced the closed universe of

Jean Bodin (c. 1529—1596) The humanist philosopher and jurist Jean Bodin was one of the most prominent political thinkers of the sixteenth century. His reputation is largely based on his account of sovereignty which he formulated in the Six Books of the Commonwealth. Bodin lived at a time of great upheaval, when France was ravaged by the wars of religion between the Catholics and the

Cloning In biology, the activity of cloning creates a copy of some biological entity such as a gene, a cell, or perhaps an entire organism. This article discusses the biological, historical, and moral aspects of cloning mammals. The main area of concentration is the moral dimensions of reproductive cloning, specifically the use of cloning in order to procreate. The article summarizes the different types of

The Moral Permissibility of Punishment The legal institution of punishment presents a distinctive moral challenge because it involves a state’s infliction of intentionally harsh, or burdensome, treatment on some of its members—treatment that typically would be considered morally impermissible. Most of us would agree, for instance, that it is typically impermissible to imprison people, to force them to pay monetary sanctions or engage in community