Classical Theory

120 Famous Easy Piano Songs for Beginners is more than a songbook, it's a step-by-step piano course with lessons and music theory, based on famous tunes and simplified classical pieces. It's perfect for ages 11 and up, and for adults of any age, even without prior musical experience.

Number theory is the branch of mathematics that is primarily concerned with the counting numbers. Of particular importance are the prime numbers, the "building blocks" of our number system. The subject is an old one, dating back over two millennia to the ancient Greeks, and for many years has been studied for its intrinsic beauty and elegance, not least because several of its challenges are so easy to state that everyone can understand them, and yet no one has ever been able to resolve them. But number theory has also recently become of great practical importance.

In 1927, classical liberalism, based on a belief in individualism, reason, capitalism, and free trade, was dying, when one of the 20th century's greatest social thinkers wrote this combative and convincing restatement. Nowhere are the key principles of Mises' philosophy better represented than in this timeless work. Mises was a careful and logical theoretician who believed that ideas rule the world, and this especially comes to light in Liberalism.