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I notice that the earliest version of this post[0] is dated 1999, whilst the latest version is modified in 2001 (see the main link). Which year would be appropriate to mark it on HN? 1999? 2001?

[0] https://web.archive.org/web/20000310230940/http://sites.inka...

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IMO the latest update is the best option. Or a syntax like (<original date>, updated <update date>) if the update was not super substantial.

sqrt(1999 * 2001)

(1999^-1 + 2001^-1)^-1

2000ish

(|1999> + |2001>)*Sqrt(1/2)

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