closed forms

Noun

closed form (countable and uncountable, plural closed forms)

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 differential form whose exterior derivative is zero.
3. A type of poetry with regular structure, such as meter or a rhyming pattern.
4. Trobar clus.
5. Used other than figuratively or idiomatically: see closed, form.
   • If ω is a closed form, then dω=0.