Individual #quantum_mechanics__quantummechanic  the branch of quantum physics that accounts for matter at the atomic level; an extension of statistical mechanics based on quantum theory (especially the Pauli exclusion principle)
  >part:  wave_mechanics  the modern form of quantum theory; an extension of of quantum mechanics based on Schrodinger's equation; atomic events are explained as interactions between particle waves
  >part of:  quantum_physics  the branch of physics based on quantum theory
     >part of:  physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions

No statement uses or specializes quantum_mechanics; click here to add one.