#mathematical_statement  a statement of a mathematical relation
  supertype:  #statement  a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc; "according to his statement he was in London on that day"
  part:  #mathematical_notation
  subtype:  #equation  a mathematical statement that two expressions are equal
     subtype:  #regression_equation__regression_of_y_on_x  the equation representing the relation between selected values of one variable (x) and observed values of the other (y); it permits the prediction of the most probable values of y
     subtype:  #linear_equation  a polynomial equation of the first degree
     subtype:  #quadratic_equation__quadraticequation__quadratic  an equation in which the highest power of an unknown quantity is a square
     subtype:  #biquadratic_equation__biquadraticequation__biquadratic  and equation of the fourth degree
     subtype:  #differential_equation  an equation containing differentials of a function
        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
     subtype:  #exponential_equation__exponentialequation  an equation involving exponential functions of a variable
  subtype:  #formula__expression  a group of symbols that make a mathematical statement
     subtype:  #sentential_function  formal expression containing variables; becomes a sentence when variables are replaced by constants
     subtype:  #primitive.formula  a mathematical expression from which another expression is derived
     subtype:  #exponential_expression__exponentialexpression  a mathematical expression consisting of the constant e raised to some power

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