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I'd like to make a RegionPlot on a ternary diagram, meaning in a triangle where the axis are $x,y,z$, which are related by $x+y+z=1$. The RegionPlot would have as a condition $x^2+y^2<1$ for example.

These are examples of ternary diagram : https://www.google.com/search?q=ternary+diagram&safe=active&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiv37DH_-7bAhWBGhQKHTPjCYMQ_AUICigB&biw=1920&bih=1089

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    $\begingroup$ What exactly is your question? What have you tried? What do you want to achieve? $\endgroup$ – Lukas Lang Jun 25 '18 at 14:17
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    $\begingroup$ You could take inspiration from (39733) and (119328). $\endgroup$ – MarcoB Jun 25 '18 at 14:22
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    $\begingroup$ Here is also a way to get more or less nice axes : (172421). $\endgroup$ – Henrik Schumacher Jun 25 '18 at 16:16

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