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To: tuhs@minnie.tuhs.org
From: Ralph Corderoy <ralph@inputplus.co.uk>
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Date: Wed, 12 Jan 2022 10:38:23 +0000
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Subject: Re: [TUHS] TeX and groff (was: roff(7))
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Hi Jon,

> I never understood "interpolating a register" to have any relation to
> the definition of interpolate that I learned in math.

The first definition makes sense of it:

    1. (transitive, intransitive) To introduce (something) between other
    things; especially to insert (possibly spurious) words into a text.

        in verse 74, the second line is clearly interpolated

    2. (mathematics) To estimate the value of a function between two
    tabulated points.

    3. (computing) During the course of processing some data, and in
    response to a directive in that data, to fetch data from a different
    source and process it in-line along with the original data. 

        ― https://en.wiktionary.org/wiki/interpolate

-- 
Cheers, Ralph.