#series.polynomial  (mathematics) the sum of a finite or infinite sequence of expressions
  supertype:  polynomial  a mathematical expression that is the sum of a number of terms
  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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