31. It is a directed acyclic graph where the nodes of the graph are factors. 32. And in an acyclic orientation, every face must have at least one sink. 33. A molecule containing no rings is called an acyclic or open-chain compound. 34. The graph corresponding to the Levi graph of this generalization is a directed acyclic graph. 35. The file system is therefore organised in a directed acyclic graph ( DAG ) structure. 36. The new problem only contains binary constraints; their scopes form a directed acyclic graph. 37. The model can be further extended to handle markets in an arbitrary directed acyclic graph. 38. An application written for Dryad is modeled as a directed acyclic graph ( DAG ). 39. The second is that of acyclic complexes. 40. Directed acyclic graphs also share this property.
