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This is the first video in our 'Introduction to Quantum Mechanics' series. In the first video I gave a brief introduction to what quantum mechanics is and how it is different from classical mechanics and statistical mechanics. While classical physics relies on the idea that the future is deterministic, quantum mechanics relies on the assumption that the world is probabilistic and that events occur randomly.

I also gave an overview of how quantum mechanics began. At the beginning of the 20th century, classical physics was challenged on two fronts: the relativistic domain and the microscopic domain. In 1905, Albert Einstein discovered that Newton's laws of motion no longer hold at speeds close to that of light. Then, in the first quarter of the 20th century, a series of experiments such as black body radiation, the photoelectric effect and the Compton effect showed that classical physics cannot even explain the behavior of light and subatomic particles.

Historically, there are two representations of quantum mechanics: the Heisenberg image in which dynamic quantities are represented by a matrix, and the Schrödinger image, in which differential equations are used.

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