Re: [xml2rfc] Evolving <u (Re: [Tools-discuss] [Rfc-markdown] New xml2rfc release: v3.16.0)

["Martin J. Dürst" <[e-mail]>]

On 2023-01-20 18:17, Carsten Bormann wrote:

> (*) OK, Pete beat me up properly in private for using א and not ℵ in a recent example (involving ℵ₀) — but here it is important for authors and editors to hit the right code point; the reader doesn’t care.

For those who don't have the time to check this out, but want to know 
what's going on:

The first א is U+05D0, HEBREW LETTER ALEF, the first letter of the 
Hebrew 'alphabet' (technically correct term is 'abjad', not 'alphabet'). 
It is of course RTL (right-to-left), which you may be able to check out 
by moving the cursor over it in an editor or trying to select it and a 
few letters around it on display (your mileage may vary).

The second ℵ is U+2135, ALEF SYMBOL, used to denote cardinalities in 
Mathematics, and is LTR. ℵ₀ is the cardinality of the natural numbers, 
and therefore this is the right character here.

Depending on the font(s) that are used to display these messages to you, 
the two letters may look more or less similar. Differences may result 
from the fact that the letters come from different fonts (if that's 
needed because the fonts you use don't cover both at the same time) or 
from the fact that the font designer(s) adjusted the former to work well 
visually with the rest of Hebrew, and the later to work visually well 
with other Math-related characters.

Regards,    Martin.


P.S.: https://r12a.github.io/app-conversion/ is a convenient tool for 
this kind of inquiries.