type class Boolean

[Oleg Grenrus]

Wikipedia [1] has references

> Bob Bemer added the \ character to the ASCII character set on
September 18, 1961,[3][4] as the result of character frequency studies.
In particular, the \ was introduced so that the ALGOL boolean operators
∧ (and) and ∨ (or) could be composed in ASCII as /\ and \/
respectively.[4][5]

- Oleg

[1] https://en.wikipedia.org/wiki/Backslash
[3] http://www.thocp.net/biographies/bemer_bob.htm
[4]
https://web.archive.org/web/20130119163809/http://www.bobbemer.com/BACSLASH.HTM
[5]
https://web.archive.org/web/20090604210339/http://home.ccil.org/~remlaps/www.bobbemer.com/BRACES.HTM

On 27.12.2020 12.03, Ben Franksen wrote:
> Am 23.12.20 um 22:40 schrieb Jon Purdy:
>> otherwise I like ‘(/\)’ and ‘(\/)’—which, after all, are the very
>> reason the backslash was added to ASCII in the first place.
> Interesting. Out of curiosity: do you have a reference for this?
>
> Cheers
> Ben
>
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