Individual #infinitesimal_calculus__calculus__the_calculus  the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
  >part of:  #pure_mathematics  the branches of mathematics that study and develop the principles of mathematics for their own sake rather than for their immediate usefulness
  >part:  #analysis.infinitesimal_calculus__analysi  a branch of mathematics involving calculus and the theory of limits; sequences and series and integration and differentiation
     >part:  #Fourier_analysis__harmonic_analysis  analysis of a periodic function into a sum of simple sinusoidal components
  >part:  #differential_calculus__method_of_fluxions  the part of calculus that deals with the variation of a function with respect to changes in the independent variable (or variables) by means of the concepts of derivative and differential
  >part:  #integral_calculus  the part of calculus that deals with integration and its application in the solution of differential equations and in determining areas or volumes etc.
  >part:  #calculus_of_variations  the calculus of maxima and minima of definite integrals

No statement uses or specializes #infinitesimal_calculus; click here to add one.