reserve GS for GraphStruct;
reserve G,G1,G2,G3 for _Graph;
reserve e,x,x1,x2,y,y1,y2,E,V,X,Y for set;
reserve n,n1,n2 for Nat;
reserve v,v1,v2 for Vertex of G;

theorem Th132:
  for G being _Graph, e,v,w being object
  st e DSJoins {v},{w},G holds e DJoins v,w,G by TARSKI:def 1;
