# Change VertexSize in ShowGraph from Combinatorica

I am using HasseDiagram from Combinatorica (in 10.1). I am very happy to have found HasseDiagram because I am drawing Hasse diagrams. I also like that they are just black. However, I cannot access the vertex size. ShowGraph from Combinatorica only takes VertexStyle not VertexSize as an option and I don't get how to manipulate the size with this. VertexStyle->Thick does not do anything. Here is what I use:

ShowGraph[HasseDiagram@MakeGraph[{1, 2, 3}, #1 - #2 == 1 &],VertexStyle-> ?????]


Is there a way to make vertices thicker?

The same way as in, e.g., ListPlot:
ShowGraph[HasseDiagram@MakeGraph[{1, 2, 3}, #1 - #2 == 1 &],

• Thanks! The ListPlot reference might help me also in the future. It takes some experience to see through the different sets of available options for some graphics related commands. I get the feeling there are maybe two main classes but I haven't figured it out yet... – tortortor Oct 22 '16 at 2:01