收敛半径r是一个非负的实数或无穷大，使得在 | z -a| < r时幂级数收敛，在 | z -a| > r时幂级数发散。
求幂级数收敛域最关键的是求它的收敛半径。
To find the solution of power series convergence domain, it is important to get its radius of convergence.
在一个很广泛的信赖域半径选择规则下，证明了算法的强收敛性。
The strong convergence of the algorithm under a general choice for radius of trust region is proved.
暗穴临界安全厚度随着暗穴断面尺寸、暗穴半径收敛值、安全系数、地面荷载等参数的增大而增大。
The critical safety thickness of hidden cavity increases with the augment of hidden cavity section size, radial constringency, safety coefficient and surface loading.
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