User Portlet User Portlet

Discussions
It's strange. If Graph is an atom than why we can browse Graph in FullForm? In[57]:= FullForm@Graph[{1->2,3->2}] Out[57]= Graph[List[1,2,3],List[DirectedEdge[1,2],DirectedEdge[3,2]]] On the other hand, we can't change Head for Graph...