According to MathWorld (http://mathworld.wolfram.com/GraphJoin.htmlMathWorld >> GraphJoin), Mathematica could compute the join of two graphs with the GraphJoinGraphJoin
command, part of CombinatoricaCombinatorica
. This command no longer works as of v10, and I cannot find a replacement. I want something like:
GraphJoin[PathGraph[{a, b}], PathGraph[{c, d, e}]]
To produce $G_1+G_2$ below.