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I'm trying to plot the two-variable function below.

(1-4/3*d4)/(1-d-d4) where 0<d4<3/4 and d4<3d and d+d4 <1.

How to plot function with many conditions like this?

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  • 1
    $\begingroup$ Look up RegionFunction $\endgroup$ – Szabolcs Jun 4 at 13:36
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Try

Plot3D[(1 - 4/3*d4)/(1 - d - d4), {d, 0, 1}, {d4, 0, 1}
, RegionFunction ->Function[{d, d4}, 0 < d4 < 3/4 && d4 < 3 d && d + d4 < 1],PlotRange -> All]    

enter image description here

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