Polyhedron(ieqs = [[RDF(2/3), RDF(1/3), RDF(-1/3*sqrt(3))]], field=RDF) 

And other fields are hard to implement since there is no implementation of 
the double description method for arbitrary fields. Feel free to send a 
patch...

I don't remember when I implemented plot() but that was a while ago. 
Apparently you are not running the latest version.

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