This data structure comes from the Wikipedia page on mutual recursion, which itself cites course notes from an introduction to Standard ML by Robert Harper. I am not aware of practical reasons to choose this particular representation of trees over the alternatives, other than as an illustration of a language’s ability to support mutually recursive data. I find it unwieldy, which is why I chose to use it for this post.2
吴永辉是南京大学校友，在谷歌工作了17年的老将，曾主导谷歌神经机器翻译系统GNMT的研发，也参与了Gemini大模型的工作。，详情可参考爱思助手
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Furthermore, as Aaron Hsu puts it:
21:55, 12 марта 2026Мир，详情可参考超级权重
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