Index - D
| decideNeutral | Zsyntax.Labelled.Rule.Interface, Zsyntax.Labelled.Rule | 
| DecoratedFormula | Zsyntax.Labelled.Rule.Frontier, Zsyntax.Labelled.Rule | 
| DecoratedLSequent | Zsyntax | 
| deepHetComp | Zsyntax.Labelled.Formula | 
| Delay | Otter.SearchRes, Otter | 
| delay | Otter.SearchRes, Otter | 
| DerivationTerm | Zsyntax.Labelled.DerivationTerm | 
| dfLabel | Zsyntax.Labelled.Rule.Frontier, Zsyntax.Labelled.Rule | 
| doSearch | Otter.Internal.Search | 
| DTFocMatchRes | Zsyntax.Labelled.Rule.BipoleRelation, Zsyntax.Labelled.Rule | 
| DTMatchRes | Zsyntax.Labelled.Rule.BipoleRelation, Zsyntax.Labelled.Rule |