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short communications
It is shown that the sets of phase angles of a structure which satisfy the tangent formula correspond also to extremal values of a function G = - ⅙ 
| EhEkEh - k| cos (φk + φh - k- φh). This fact may simplify the computational implementation of the tangent formula and those of its extensions that can also be formulated as optimization problems.
| EhEkEh - k| cos (φk + φh - k- φh). This fact may simplify the computational implementation of the tangent formula and those of its extensions that can also be formulated as optimization problems. 
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