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Dec 2, 2019 at 18:41 history edited Ivan Izmestiev CC BY-SA 4.0
added 437 characters in body
Dec 2, 2019 at 15:27 comment added Richard Stanley Sure, you can add a picture.
Dec 2, 2019 at 8:18 comment added Ivan Izmestiev Yes, indeed. Have not known about this. May I add a picture to my answer?
Dec 2, 2019 at 3:13 comment added Richard Stanley If $a=b=c$ then $3(x^4+y^4+z^4+a^4)=(x^2+y^2+z^2+a^2)^2$. It is an interesting exercise to find a noncomputational reason why this equation is symmetric in $x,y,z,a$. (Symmetry in $x,y,z$ is obvious.)
Dec 1, 2019 at 15:46 history answered Ivan Izmestiev CC BY-SA 4.0