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A List of Inconveniences between Quantum Mechanics & (general) Relativity?

What Does It Mean for a Hamiltonian or System to Be Gapped or Gapless?

What Is the Physical Meaning of Commutation of Two Operators?

Why Not Using Lagrangian, Instead of Hamiltonian, in Non Relativistic QM?

Klein–Gordon Equation

Definite Parity of Solutions to a Schrödinger Equation with Even Potential?

Is It Possible to Recover Classical Mechanics from Schrödinger's Equation?

In Quantum Mechanics, given Certain Energy Spectrum Can One Generate the Corresponding Potential?

What's Wrong with This Derivation That $i\hbar = 0$?

What Are the Most Fundamental Assumptions of Quantum Mechanics?