closed form

noun4

1. •
   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. •
   A type of poetry with regular structure, such as meter or a rhyming pattern.
3. •
   A differential form whose exterior derivative is zero.
4. •
   Trobar clus.