Proof by infinite descent

Closed form may refer to:

Mathematics

• Closed-form expression, a finitary expression
• Closed differential form, a differential form $\alpha$ with the property that $d\alpha =0$

Poetry

• In poetry analysis, a type of poetry that exhibits regular structure, such as meter or a rhyming pattern;
• Trobar clus, an allusive and obscure style adopted by some 12th-century troubadours.