4
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I think Mathematica goes wrong if asked to plot this very simple region:

Region2 = ImplicitRegion[x < -1 && y < -1/x, {{x, -3, 0}, {y, 0, 1}}]

by means of the command

RegionPlot[Region2, PlotRange -> {{-3, 0}, {0, 1}}]

The output is

enter image description here

while I expected the region below the curve.

Do you know why this happens and how it can be solved?

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  • 3
    $\begingroup$ I get the correct plot: i.sstatic.net/DOovW.png (V11.3.0, MacOS) $\endgroup$
    – Michael E2
    Feb 26, 2019 at 14:26
  • 1
    $\begingroup$ I get the region you expect on 11.3 $\endgroup$ Feb 26, 2019 at 14:26
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    $\begingroup$ MMA v11.0.1 also gives a wrong result. Try RegionPlot[x < -1 && y < -1/x, {x, -3, 0}, {y, 0, 1}] $\endgroup$ Feb 26, 2019 at 15:10
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    $\begingroup$ Works as expected with version 10.4.1 for Mac OS X x86 (64-bit) (April 11, 2016) $\endgroup$
    – Bob Hanlon
    Feb 26, 2019 at 18:45
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    $\begingroup$ I get OP's (wrong) region 10.0 for Mac OS X x86 (64-bit) (December 4, 2014). $\endgroup$
    – march
    Feb 26, 2019 at 18:52

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