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    $\begingroup$ Why don't you just write the body of the Function in the Function? Then you don't need the Module at all. $\endgroup$ Commented Apr 20 at 6:11
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    $\begingroup$ RegionFunction -> Function[{x, y}, z > 0] is wrong syntax. "Function" has the attribute "HoldAll". Therefore, z is not evaluated. You either need: Function[{x, y},x+y > 0] or Function[{x, y}, Evaluateüz > 0] $\endgroup$ Commented Apr 20 at 7:31
  • $\begingroup$ @lericr thank you but how to do that $\endgroup$ Commented Apr 20 at 7:35
  • $\begingroup$ @DanielHuber thank you but how to rewrite my RegionFunction $\endgroup$ Commented Apr 20 at 7:35
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    $\begingroup$ Strongly related: mathematica.stackexchange.com/q/302595/1871 $\endgroup$ Commented Apr 24 at 5:58