#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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