isTree -- determines whether a graph is a tree

• Usage:

  t = isTree G

• Inputs:
  • G, a graph,
• Outputs:
  • t, a Boolean value, whether a graph is a tree

i1 : G = graph({{1,2},{1,3},{3,4},{3,5}},EntryMode=>"edges");

i2 : isTree G

o2 = true