> When Knuth's 1984 The TeXbook needed an example of blackboard bold for the index, he produced ℝ using the letters I and R with a negative space between; in 1988 Robert Messer extended this to a full set of "poor person's blackboard bold" macros, overtyping each capital letter with carefully placed I characters or vertical lines.
> Not all mathematical authors were satisfied with such workarounds.
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[ 3.6 ms ] story [ 17.0 ms ] thread> Not all mathematical authors were satisfied with such workarounds.