this post was submitted on 30 Apr 2024
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-19
๐•: What Comes After ๐•? (y-after.social)
submitted 6 months ago* (last edited 6 months ago) by [email protected] to c/[email protected]
16 comments fedilink hide all child comments
 

A nice, concise overview of the reasons to move away from social media, and how to do it, including the Fediverse and POSSE.

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[โ€“] [email protected] 7 points 6 months ago (1 children)

If โ„• is natural numbers and โ„š is rational numbers and โ„ค is integers and โ„ is the rational numbers, what are ๐• and ๐•?

[โ€“] [email protected] 6 points 6 months ago* (last edited 6 months ago)

Not aware of any specific usages, but maybe they're used as meta-sets. e.g. "consider a set of numbers ๐• and a set of numbers ๐• ... etc, which can't be done with the defined letters.

Unicode originally only had the double-struck letters for the defined sets โ„‚, โ„, โ„•, โ„™, โ„š, โ„ and โ„ค, but the full alphabets were later added at higher code-points with "reserved" gaps where the defined seven letters would otherwise appear.

(Complex, Hamiltonian quaternions, Natural, Prime, Quotient (rational), Real and Zahlen, a German word for counting numbers, for anyone wondering.

Quick edit: Zahl is cognate with English "tell" and "tale" which are both related to "tally", believe it or not. "Recounting a tale" didn't used to mean telling(!) a story, but instead literally checking a previous count, and developed the wider sense later.

Also, โ„ not getting "โ„š" because โ„š couldn't have "โ„" is kind of funny.).