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Limit[Re[z], z -> ComplexInfinity] 输出 ComplexInfinity
Limit[Im[z], z -> ComplexInfinity, Direction -> 1] 输出 0
Limit[Im[z], z -> ComplexInfinity, Direction -> I] 输出 ∞ (实无穷大)
但为什么 Limit[Im[z], z -> ComplexInfinity] 输出 0 呢? 默认是Direction->1 ?
类似地, Limit[Arg[z], z -> ComplexInfinity] 输出 0 |
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