Quantum Chemistry: Postulates and Harmonic Oscillator

This lecture covers the historical perspective of quantum mechanics, including the postulates of quantum mechanics, the harmonic oscillator, and three-dimensional systems. It delves into topics such as the Heisenberg Uncertainty Principle, operators, and the harmonic oscillator problem. The lecture also discusses approximation methods, perturbation theory, and the variational principle, along with the treatment of simple molecules and many-electron atoms.