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  • $\begingroup$ What MathematicaVersion do you use (I have 10.0.2.0) I get the error even when I copy and paste your answer.... $\endgroup$ Commented Feb 7, 2015 at 14:20
  • $\begingroup$ I copied the wrong line from my notebook. The correct expression appears now. Thanks for identifying my mistake. For completeness, I too have V10.0.2.0. $\endgroup$ Commented Feb 7, 2015 at 14:28
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    $\begingroup$ I think this is a very interesting finding on your part, but I still think the OP's version ought to work. I have submitted a problem report to WRI tech support arguing the issue. $\endgroup$ Commented Feb 7, 2015 at 14:35
  • $\begingroup$ @m_goldberg At a minimum, documentation is ambiguous. For single variables, it shows x\[Element]reg, but for multiple variables {x, y} \[Element] reg. It was this disparity that caused me to try {x}. I think you should report the issue. Thanks. $\endgroup$ Commented Feb 7, 2015 at 14:40
  • $\begingroup$ @m_goldberg Thank you for editing my answer (and the question by @mgamer) to replace \[Pi] by π, etc. Where can we find Greek and special characters to paste into questions, answers, and comments? I searched "Help" without success. Thanks. $\endgroup$ Commented Feb 7, 2015 at 16:43