Very Short

Very Short Introductions: Brilliant, Sharp, Inspiring

Very Short Introductions: Brilliant, Sharp, Inspiring

A vast system of prisons, camps, and exile settlements, the Gulag was one of the defining attributes of the Stalinist Soviet Union and one of the most heinous examples of mass incarceration in the twentieth century, combining the functions of a standard prison system with the goal of isolating and punishing alleged enemies of the Soviet regime. it stretched throughout the Soviet Union, from central Moscow to the farthest reaches of Siberia. From its creation in 1930 to its partial dismantling in the mid-1950s, approximately 25 million people passed through the Gulag.

Very Short Introductions: Brilliant, Sharp, Inspiring

The study of geometry is at least 2500 years old, and it is within this field that the concept of mathematical proof - deductive reasoning from a set of axioms - first arose. To this day geometry remains a very active area of research in mathematics.

What is time? What does it mean for time to pass? Is it possible to travel in time? What is the difference between the past and future? Until the work of Newton, these questions were purely topics of philosophical speculation. Since then we've learned a great deal about time, and its study has moved from a subject of philosophical reflection to instead became part of the subject matter of physics.