#total__sum  a quantity obtained by addition
  supertype:  #quantity  something that has a magnitude and can be represented in mathematical expressions by a constant or a variable
  subtype:  #polynomial  a mathematical expression that is the sum of a number of terms
     subtype:  #monic_polynomial__monicpolynomial  a polynomial in one variable
     subtype:  #quadratic_polynomial__quadraticpolynomial__quadratic  a polynomial of the second degree
     subtype:  #biquadratic_polynomial__biquadraticpolynomial__biquadratic__quartic_polynomial__quarticpolynomial  a polynomial of the fourth degree
     subtype:  #series.polynomial  (mathematics) the sum of a finite or infinite sequence of expressions
        subtype:  #power_series  the sum of terms containing successively higher integral powers of a variable
        subtype:  #convergency  the approach of an infinite series to a finite limit
        subtype:  #divergency__divergence  an infinite series that has no limit
        subtype:  #geometric_series  a geometric progression written as a sum
        subtype:  #Fourier_series  the sum of a series of trigonometric expressions; used in the analysis of periodic functions
        subtype:  #exponential_series  a series derived from the expansion of an exponential expression

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