Hi!  I don't think this is necessarily a notebook question, so I'm 
forwarding this to sage-support where it is morel likely to get some 
responses.  Good luck!
 

> Hi, 
>
> I would like to get a left and right subtree from a vertice. 
> First i used Graph abd option layout. The graph don't respect the order of 
> suns. 
>
> g=DiGraph({"*":["+","-"],"-":["d","c"],"+":["a","b"]}) 
>
> g.order(), g.size() 
> g.vertices() 
> g.edges() 
> g.show(layout='tree') 
>
> Does someone have an idea? How to plot the tree in order abd get right and 
> left subtrees? 
> Dominique

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