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Subject: Re: [TUHS] TeX and groff (was: roff(7))
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Been reading the heirloom docs.  Remember one thing that I disliked
about troff which maybe Doug can explain.  It's the language in the
docs.  I never understood "interpolating a register" to have any
relation to the definition of interpolate that I learned in math.
Made it a bit hard to learn initially.

Any memory of why that term was used?