For very general single location on a closed convex domain, propose a combining algorithm which has global convergence.

针对一般具闭凸集约束的单址选址模型，提出具全局收敛性的组合算法。

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The algorithm is very simple and suitable for finding all undirected Hamiltonian circuits in general undigraph.

算法简便，适合于求解一般无向图中全部哈密顿回路。

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We derived an approximate algorithm from geocentric to geodetic coordinates. The algorithm is very simple, but its accuracy can satisfied general geo-science research.

给出了一种由地心坐标到大地坐标的近似算法，这种算法非常简单，但它的精度可以满足一般地学研究的需要。

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