**Statement 1.** \(f(x,y)\) is a function that is cyclic in the variables, does this mean that subject to \( x+y = 1 \), the local minimum or maximum can only occur at \( f( \frac{1}{2}, \frac{1}{2} ) ? \)

**Statement 2.** \(f(x,y,z)\) is a function that is cyclic in the variables, does this mean that subject to \( x + y + z = 1 \), the local minimum or maximum can only occur at \( f( \frac{1}{3}, \frac{1}{3}, \frac{1}{3} ) \)?

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TopNewestFor counterexamples, take \[f(x,y)=xy\] and \[f(x,y,z)=xyz\] – Daniel Chiu · 3 years ago

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I've updated it slightly, to get at the original intention. – Chung Kevin · 3 years ago

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