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对2＋1维U（1）格点规范场论真空态进行研究，仔细推导出连续极限下真空谈函数中参数μ_0和μ_2的普适表达式，并用截断本征方程法进行数值计算．
In this paper, the field states of the 2 + 1 dimensional U (1) lattice gauge field are studied. The universal expressions of the parameters μ_0 and μ_2 in the vacuum function under continuous limit are carefully deduced. The truncated eigenvalue method is used to calculate the values.