These lecture series consist of three parts. The first lecture introduces the basical principles of quantum mechanics, presenting how particles move in quantum world rather than in classcial world.  The second lecture introduces three equivalent expressions of quantum mechanics, including the Heisenberg Matrix Mechanics, the Schrodinger Wave Mechanics and Feynman's path integral.  The third lecture focuses on one of the most important concepts, operator, in quantum mechanics, providing several illustrative typical examples, such as observables (Hermitian Operators), measurement (Projections Operators), and time evolution operators (Unitary Operators).

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