#differential_equation  an equation containing differentials of a function
  supertype:  equation  a mathematical statement that two expressions are equal
  subtype:  Maxwell's_equations  four differential equations that summarize classical properties of electromagnetic fields
  subtype:  partial_differential_equation  a differential equation involving a functions of more than one variable
  subtype:  Schrodinger_equation__Schrodinger_wave_equation  the fundamental equation of wave mechanics
  subtype:  wave_equation  a differential equation that describes the passage of harmonic waves through a medium

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