(x*y)^(1/2) Disciplined convex programming error: Invalid quadratic form(s): not a square

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(x*y)^(1/2) Disciplined convex programming error:
Invalid quadratic form(s): not a square.

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variables x y
(x*y)^(1/2) Disciplined convex programming error:
Invalid quadratic form(s): not a square.

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Use geo_mean([x y]).image