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edited Feb 25, 2017 at 8:45

In version 11: You can also use RegionBoundary,e.g:

reg = ImplicitRegion[(x^2 + y^2)^3 <= 3 x^2 y^2, {x, y}];
bndy = RegionBoundary[reg];
RegionPlot[bndy]

You can also use RegionBoundary,e.g:

reg = ImplicitRegion[(x^2 + y^2)^3 <= 3 x^2 y^2, {x, y}];
bndy = RegionBoundary[reg];
RegionPlot[bndy]

In version 11: You can also use RegionBoundary,e.g:

reg = ImplicitRegion[(x^2 + y^2)^3 <= 3 x^2 y^2, {x, y}];
bndy = RegionBoundary[reg];
RegionPlot[bndy]

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created Feb 25, 2017 at 5:59

You can also use RegionBoundary,e.g:

reg = ImplicitRegion[(x^2 + y^2)^3 <= 3 x^2 y^2, {x, y}];
bndy = RegionBoundary[reg];
RegionPlot[bndy]