The time-independent Schrödinger equation is a fundamental equation in quantum mechanics that describes how the quantum state of a physical system changes in space, independent of time. It is expressed as $$-\frac{\hbar^2}{2m} \nabla^2 \psi + V \psi = E \psi$$, where $$\psi$$ is the wave function of the system, $$V$$ is the potential energy, and $$E$$ is the total energy. This equation plays a crucial role in determining the allowed energy levels and corresponding wave functions of quantum systems.
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