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ApproachFrom should be able to name a direction in the complex plane

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还没有人认领这个 Issue。

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5/5
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一周以上
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Issue 类型
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描述清晰度
基本清楚
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活跃
技术栈
csharp

调研方向

首先定位公开的 ApproachFrom enum 并阅读 ComputeLimitImpl,然后查看相关 issue #596 中的上下文。定义有向情况如何表示 e^(i*theta)/x,并验证 Left 和 Right 保留其现有含义,而有向极限使用广义替换。

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描述

Split out of #596, where @Happypig375 noted: "we should also add some way to represent a limit direction in the complex plane."

ApproachFrom is Left, Right, BothSides. On the real line that is the whole story. In the complex plane it is not: approaching 0 along the negative reals is one ray out of infinitely many, so lim x->0- ln(x) = -oo is really a directional limit that happens to be spelled "from the left".

This matters beyond notation. Under a complex codomain, "from the left" and "from the right" are two arbitrary rays, and there is no reason the two of them agreeing should say anything about the limit as a whole -- which is part of why the promotion in the sibling issue has to be tied to the codomain rather than applied generally.

Shape

ApproachFrom grows a way to name a direction, e.g. a limit along e^(i*theta), with Left and Right staying as the theta = pi and theta = 0 cases so nothing existing changes. ComputeLimitImpl already maps a finite destination to infinity by substituting dest +- 1/x; the directional case is dest + e^(i*theta)/x, so the substitution generalises cleanly.

It is an enum that has to grow rather than a rule that has to change, which is why this is filed separately -- it is a public API change and wants its own discussion.

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