graphs algebra advanced algebra senior seminar geometry analytic geometry english comp figure degree comparative literature course prerequisites to obtain your degreeyou must complete the senior seminar and (because of pressure from the english departmentcomparative literature but you can' take senior seminar without having already taken advanced algebra and analytic geometryand you can' take comparative literature without taking english composition alsoyou need geometry for analytic geometryand algebra for both advanced algebra and analytic geometry directed graphs as figure showsa graph can represent this sort of arrangement howeverthe graph needs feature we haven' seen beforethe edges need to have direction when this is the casethe graph is called directed graph in directed graph you can proceed only one way along an edge the arrows in the figure show the direction of the edges in programthe difference between non-directed graph and directed graph is that an edge in directed graph has only one entry in the adjacency matrix figure shows small directed graphtable shows its adjacency matrix figure small directed graph