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

The Upaniṣads The Upaniṣads are ancient texts from India that were composed orally in Sanskrit between about 700 B.C.E. and 300 B.C.E. There are thirteen major Upaniṣads, many of which were likely composed by multiple authors and are comprised of a variety of styles. As part of a larger group of texts, known as the Vedas, the Upaniṣads were composed in a ritual context, yet

Causation The question, “What is causation?” may sound like a trivial question—it is as sure as common knowledge can ever be that some things cause another, that there are causes and they necessitate certain effects. We say that we know that what caused the president’s death was an assassin’s shot. But when asked why, we will most certainly reply that it is because the latter

Theories of Emotion There are different theories of emotion to explain what emotions are and how they operate. This is challenging, since emotions can be analyzed from many different perspectives. In one sense, emotions are sophisticated and subtle, the epitome of what make us human. In another sense, however, human emotions seem to be very similar to (if not the same as) the responses that

Constructive Mathematics Constructive mathematics is positively characterized by the requirement that proof be algorithmic. Loosely speaking, this means that when a (mathematical) object is asserted to exist, an explicit example is given: a constructive existence proof demonstrates the existence of a mathematical object by outlining a method of finding (“constructing”) such an object. The emphasis in constructive theory is placed on hands-on provability, instead of

Jean Paul Sartre: Existentialism The philosophical career of Jean Paul Sartre (1905-1980) focuses, in its first phase, upon the construction of a philosophy of existence known as existentialism. Sartre’s early works are characterized by a development of classic phenomenology, but his reflection diverges from Husserl’s on methodology, the conception of the self, and an interest in ethics. These points of divergence are the cornerstones of