closed form

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closed form ‎(uncountable)

  1. (mathematics) A form (expression) that does not use limits, implicitly or explicitly.
    There is no known representation of π in closed form: each expression for it includes an integral, an infinite series, or an infinite continued fraction.
  2. Used other than as an idiom: see closed,‎ form.
    If ω is a closed form, then dω=0.

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