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Apr 5, 2018 at 11:14 vote accept Michael Hardy
Mar 31, 2018 at 6:59 history edited Fedor Petrov CC BY-SA 3.0
added 192 characters in body
Mar 31, 2018 at 0:25 comment added Michael Hardy Instantly this function looked symmetric in $a,b,c,$ then I took a few seconds to think maybe I'd better check that since I wasn't sure plus and minus signs wout not be altered, then I applied the permutation $a\mapsto b\mapsto c\mapsto a$ to it and ascertained that it does not change, then did the same with $a\leftrightarrow b, c\leftrightarrow c$, and checked that it still didn't change. Now I'm thinking maybe my question was insufficient for what I was wondering about, but also that my question looks perfectly ok. To be continued$\,\ldots\qquad$
Mar 29, 2018 at 20:35 history answered Fedor Petrov CC BY-SA 3.0