Math input methods

Ian Clifton ian.clifton at
Wed Jun 4 09:42:26 CDT 2014

"Jukka K. Korpela" <jkorpela at> writes:

> As an aside, the ISO 80000-2 standard on mathematical notations
> describes boldface letters such as boldface R as symbols for commonly
> known sets of numbers. The double-struck letters like ℝ as mentioned
> as an alternative way, whereas in the previous standard, these
> notations were presented the other way around. The change is logical
> in the sense that bold face is a more original notation and
> double-struck letters as characters imitate the imitation of boldface
> letters when writing by hand (with a pen or piece of chalk).

I’m not sure this is going to catch on with mathematicians, not least
because bold letters are already heavily used, for vectors and matrices
for instance. My guess is mathematicians are going to stick to their
double‐struck letters for these sets for as long as the year ∈ ℕ.

Ian ◎

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