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  • $\begingroup$ Thanks for the answer. However, the plotting region I have used is real-valued (see the examples I provided). It is only the expression itself that is complex-valued (or rather, it is boolean-valued, but is an equality of complex expressions); the variables x and y are being plotted over a real region, so I'm not sure this answers my question. $\endgroup$ Commented Oct 11, 2014 at 21:33
  • $\begingroup$ I don't understand when you say your region is real valued. I see an imaginary number (I) in you expression. $\endgroup$ Commented Oct 12, 2014 at 2:11
  • $\begingroup$ No, the region is real-valued; the expression is Boolean-valued and is comprised of an Equal statement which contains an I in one of it's sub-branches. That does not make the region real-valued. As further proof, I appended a counterexample to my question, which shows that ImplicitRegion is capable of handling complex-valued expressions. $\endgroup$ Commented Oct 12, 2014 at 13:50