The KK (Knowing that One Knows) Principle In its simplest form, the KK principle says that, for any proposition p, if one knows that p, then one knows that one knows it. More complex formulations say that if one knows that p, then one is in a position to know that one knows it, and this is fleshed out in a variety of ways. One

Mathematical Platonism Mathematical platonism is any metaphysical account of mathematics that implies mathematical entities exist, that they are abstract, and that they are independent of all our rational activities. For example, a platonist might assert that the number pi exists outside of space and time and has the characteristics it does regardless of any mental or physical activities of human beings. Mathematical platonists are often

Karl Popper: Political Philosophy Among philosophers, Karl Popper (1902-1994) is best known for his contributions to the philosophy of science and epistemology. Most of his published work addressed philosophical problems in the natural sciences, especially physics; and Popper himself acknowledged that his primary interest was nature and not politics. However, his political thought has arguably had as great an impact as has his philosophy of

Epistemic Conditions of Moral Responsibility What conditions on a person’s knowledge must be satisfied in order for them to be morally responsible for something they have done? The first two decades of the twenty-first century saw a surge of interest in this question. Must an agent, for example, be aware that their conduct is all-things-considered wrong to be blameworthy for it? Or could something weaker

Xenophon (430—354 B.C.E.) Xenophon was a Greek philosopher, soldier, historian, memoirist, and the author of numerous practical treatises on subjects ranging from horsemanship to taxation. While best known in the contemporary philosophical world as the author of a series of sketches of Socrates in conversation, known by their Latin title Memorabilia, Xenophon also wrote a Symposium and an Apology which present a set of vivid

Compositionality in Language Compositionality is a concept in the philosophy of language. A symbolic system is compositional if the meaning of every complex expression E in that system depends on, and depends only on, (i) E’s syntactic structure and (ii) the meanings of E’s simple parts. If a language is compositional, then the meaning of a sentence S in that language cannot depend directly on