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Math Help - Graphs

  1. #1
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    Joined
    Mar 2009
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    77

    Graphs

    Here are 2 graphs, G1 and G2. I am given the following: Graph G1 is given as: V(G1) = {1, 2, . . . , 7}, E(G1) = {< x, y > | x < y>, x<= x+2}.

    Graph G2 is given as: V(G2) = {1, 2, . . . , 9}, E(G2) = {< x, y > | x divides y, x < y>}. Then I am asked to find and draw G1∩G2 and G1∪G2. What I don't understand is the vertices of the given graph G2 as shown below are less than 9 so why are they given as reaching 9? And what does x divides y or x < y>, x<= x+2 mean? Any explanation is appreciated. Thanks in advance!
    Attached Thumbnails Attached Thumbnails Graphs-graph.jpg  
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