TLDR : Sage easily gets the roots of the polynomial system |x2^2-x1, 
x3^4-x1, x2+x3+2] but interprets [image: \sqrt[3]{x}+\sqrt{x}+2] 
inconsistently : this expression is *not* zero for the above roots.

Details : see the enclosed Jupyter Lab sheet.

This seems to be little discussed in Sage documentation. Is it worth to 
discuss it ?
​

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Attachment: A problematic radical expression in Sage.ipynb
Description: application/ipynb

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