Citations

However, there are many places we could use subscripting to be clearer & more compact about which version we are referring to, using them as evidentials, and because it’s clearer & more compact, we can afford to use it more places without it wasting space/effort/patience. Citations are a good use case. Why write “Friedenbach (2012)” if we can write “Friedenbach₂₀₁₂”? The latter is shorter, easier to read, less ambiguous (especially if we use it in parentheticals, see Friedenbach (2012)), and doesn’t come in a dozen different slightly-varying house styles.

Evidentials

But why restrict subscripting to formal publications or written documents? Apply it to any quote, statement, or opinion where indexing variables like time might be relevant. Refusing to allow easy references to anything not a book is but codex chauvinism.

One convention, arbitrary metadata. It is a unified notation: regardless of whether something was thought, spoken, or written by me in 2020, it gets the same notation—“Gwern₂₀₂₀”. The evidential can be expanded as necessary: if it’s a paper or essay, the ‘2020’ can be a hyperlink, or if it’s a ‘personal communication’, then there can be a bibliography entry stating as much, or if it’s the author about their own beliefs/actions/statements in 2020, further information neither necessary nor usually possible (and it avoids awkward custom phraseology like “As I thought back in 2020 or so….”). In contrast, normal citation style cumbersomely uses a different format for each, or provides no guidance: how do you gracefully cite a paper written one year but whose author changed their mind 5 years later based on new results and who told you so 10 years after that? (“Dr. Bach originally maintained A (Bach et al. (2000)) but gradually modified his position until 2005 when he recalls writing in his diary he had lost all confidence in A (personal communication, according to Frieden 2015)…”)

Multiple Authors

‘et al’ = ‘…’ Single or double authorship is straightforward, just ‘Friedenbach₂₀₁₂’ or ‘Frieden & Bach₂₀₁₂’ But how should multi-author citations, currently denoted by ‘et al’ or ‘et al.’ or even ‘et al.’, be handled?

The existing ‘et al’ notation is pretty ridiculous: not only does it take up 6 letters and is natural language which should be a symbol, it’s ambiguous & hard to machine-parse, and it’s not even English²! Writing ‘Foo et al₂₀₁₀’ or ‘Foo_et al 2010’ doesn’t look nice, and it makes the subscripting far less compact.

My current suggestion is to do the expected thing: when you elide or omit something in English or technical writing, how do you express that? Why, with an ellipsis ‘…’, of course. So one would write ‘Foo_…2010’ or possibly ‘Foo…₂₀₁₀’. (I think the former is probably better, since there is less risk of confusion over what is being elided.)

Technical Support

Subscripts: already in a theater near you. Because it’s already used so much in technical writing, subscripting is reasonably familiar to anyone who took highschool chemistry & can be quickly figured out from context for those who’ve forgotten, and it’s well-supported by fonts and markup languages and word processors: it’s written x~t~ in Pandoc Markdown & some Markdown extensions like markdown-it (but not Reddit), x<sub>t</sub> in HTML, x<subscript>t</subscript> in DocBook, x_t in $TeX$/$LaTeX$, x\ :sub: \t in reStructuredText; and it has keybindings C-= in Microsoft Office, C-B in LibreOffice, C-, in Google Docs etc. So subscripting can be used almost everywhere immediately.

Example Use

Example: here are 3 versions of a text; one stripped of citations and evidentials, one with them written out in long form, and one with subscripts:

1. I went to Istanbul for a trip, and saw all the friendly street cats there, just as I’d read about in Abdul Bey; he quotes the local Hakim Abdul saying that the cats even look different from cats elsewhere (but after further thought, I’m not sure I agree with that there). I and my wife had a wonderful trip, although while she clearly enjoyed the trip to the city, she claimed the traffic was terribly oppressive and ruined the trip. (Oh really?)
2. In 2010, I went to Istanbul for a trip, and saw all the friendly street cats there, just as I’d read about in Abdul Bey’s 2000 Street Cats of Istanbul; he quotes the local Hakim Abdul in 1970 saying that the cats even look different from cats elsewhere (but after further thought as I write this now in 2020, I’m not sure I agree with Bey (2000)). I and my wife had a wonderful trip, although while she clearly enjoyed the trip to the city, on Facebook she claimed the traffic was terribly oppressive and ruined the trip. (Oh really?)
3. I₂₀₁₀ went to Istanbul for a trip, and saw all the friendly street cats there, just as I’d read about in Abdul Bey₂₀₀₀ (Street Cats of Istanbul); he quotes the local Hakim Abdul₁₉₇₀ saying that the cats even look different from cats elsewhere (but after further thought, I’m not sure I₂₀₂₀ agree with Bey₂₀₀₀). I and my wife had a wonderful trip, although while she clearly enjoyed the trip to the city, she claimed_FB the traffic was terribly oppressive and ruined the trip. (Oh really?)

In the first version, suppressing the metadata leads to a confusing passage. What did Bey write? We don’t learn when Abdul expressed his opinion—which is important because Istanbul, as a large fast-growing metropolis, may have changed greatly over the 40 years from quote to visit. When did the speaker become skeptical of the claim Istanbul cats both act & look different? What might explain the wife’s inconsistency, and which version should we put more weight on?

The second version answers all these questions, but at the cost of considerable prolixity, jamming in comma phrases to specify date or source. Few people would want to either write or read such a passage, and the fussiness has a distinctly fussy pseudo-academic air. Unsurprisingly, few people will bother with this—any more than they will bother providing inflation-adjusted dollar amounts of something from a decade ago (even though that’s misleading by a good 15% or so, and compounding), or they’d want to check a paywalled paper, or redo calculations in Roman numerals.

The third version may look a little alien because of the subscripts, but it provides all the information of the second version plus a little more (by making explicit the implicit ‘2020’), in considerably less space (as we can delete the circumlocutions in favor of a single consistent subscript), and reads more pleasantly (the metadata is literally out of the way until we decide we need it).

Possible Alternative Notation

I considered 3 alternatives:

1. Superscripts: already overloaded as footnotes & powers

2. Bang notation: another possible notation for disambiguating, is the “X!Y” notation (apparently derived from UUCP bang notation), which is associated with online fandoms & fanfiction, and gives notation like “2020!gwern”.

   This notation puts the metadata first, which is confusing yodaspeak (what does the ‘2020’ refer to? It dangles until you read on); it makes it inline & full-sized, and then tacks on an additional character just to take up even more space; it’s confusing and unusual to anyone who isn’t familiar with it from online fanfiction already, and to those who are familiar, it is low-status and has bad connotations.

3. Ruby annotations: as mentioned above, there is standardized HTML support (but with spotty browser support & no support at all in most other formats) for ‘ruby’ annotations which are similar to superscripts and intended for interlinear glosses.

   Unfortunately, in a horizontal language like English (as opposed to Chinese/Japanese), they require extremely high line-heights to be at all legible. Example:

   

4. New symbols: no font, editor, or word processor support kills any new symbol proposal, and can be rejected out of hand.

Disadvantages

Deal-breaker: low status? The major downside, of course, is that subscripting is novel and weird. It at least is not associated with anything bad (such as fanfics), and is associated with science & technology, but I’m sure it will deter readers anyway. Does it do enough good to be worth using despite the considerable hit to weirdness points? That I don’t know.