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283 points IdealeZahlen | 1 comments | | HN request time: 3.416s | source
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ahartmetz ◴[] No.42144383[source]
There is an old convention in physics - from the time when Germany was world-leading in physics - to write vector-valued variables in Fraktur. Using cursive (old German cursive is weird) seems related, though AFAIU the "vectorness" of the ℘ function is just the two components of a complex number.
replies(1): >>42145313 #
1. hanche ◴[] No.42145313[source]
And algebraists often use lowercase fractur for ideals.