noun

• A function returning to the same value at regular intervals.

  ‘His results concern the approximation theory of almost periodic functions.’

  More example sentences

  • ‘In particular he had found a continuous periodic function whose trigonometric interpolating polynomials, corresponding to equally spaces mesh points, diverge almost everywhere.’
  • ‘These turned out to be doubly periodic functions and are called elliptic functions.’
  • ‘This has been done by subtracting a periodic function from the data.’
  • ‘This is where any mathematical function is expressed as the sum of an infinite series of other periodic functions.’