Digraph Di"graph, n. [Gr. di- = di`s- twice + ? a writing, ? to write.] Two signs or characters combined to express a single articulated sound; as ea in head, or th in bath.Meaning of Digraph from wikipedia- ⟨
Streams. A stream is a topological space equipped with a circulation, meaning a function assigning to each open set a preorder such that the preorder of a union of open sets is generated by the preorders of these open sets [13]. In particular, considering the preorder assigned to itself...