> a formal symbolic "element of" function is necessary to represent solver > results from SymPy. The second parameter to it would be a set, i.e., one of > the usual domains used in calculus, or a finite set of numbers. This needs > conversion of sets to the symbolic ring. > > The problem is: "r" (the R interpreter object), as well as other > interpreters, is in the Sets category too, and converting it to symbolic > should raise an error. How can interpreters be differentiated from domain > sets, if not by category? > > I think you could check to see if it is an instance of Expect (from sage/interfaces/expect.py).
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