On Tue, 22 Apr 2014 02:07:58 -0700, wxjmfauth wrote:
> Le mardi 22 avril 2014 08:30:45 UTC+2, Rustom Mody a écrit :
>>
>>
>>
>>
> @ rusy
>
>> "Ive reworded it to make it clear that I am referring to the
> character-sets and not encodings."
>
> Very good, excellent, comment. An healthy coding scheme can only work
> properly with a unique characters set and the coding is achieved with
> the help of a unique operator. There is no other way to do it and that's
> the reason why we have to live today with all these coding schemes
> (unicode or not). Note: A coding scheme can be much more complex than
> the coding of "raw" characters (eg. CID fonts).
>> "So instead of using λ (0x3bb) we should use 𝝀 (0x1d740) or
>> something thereabouts like 𝜆"
For those who cannot see them, they are:
py> unicodedata.name('\U0001d740')
'MATHEMATICAL BOLD ITALIC SMALL LAMDA'
py> unicodedata.name('\U0001d706')
'MATHEMATICAL ITALIC SMALL LAMDA'
("LAMDA" is the official Unicode name for Lambda.)
> This is a very good understanding of unicode. The letter lambda is not
> the mathematical symbole lambda. Another example, the micro sign is not
> the greek letter mu which is not the mathematical mu.
Depends what you mean by "is not". The micro sign is a legacy
compatibility character, we shouldn't use it except for compatibility
with legacy (non-Unicode) character sets. Instead, we should use the NFKC
or NFKD normalization forms to convert it to the recommended character.
py> import unicodedata
py> a = '\N{GREEK SMALL LETTER MU}' # Preferred
py> b = '\N{MICRO SIGN}' # Legacy
py> a == b
False
py> unicodedata.normalize('NFKD', b) == a
True
py> unicodedata.normalize('NFKC', b) == a
True
As for the mathematical mu, there is no separate Unicode "maths symbol
mu" so far as I am aware. One would simply use '\N{MICRO SIGN}' or
'\N{GREEK SMALL LETTER MU}' to get a μ.
Likewise, the λ used in mathematics is the Greek letter λ, not a separate
symbol, just like the Latin letter x and the x used in mathematics are
the same.
--
Steven D'Aprano
http://import-that.dreamwidth.org/
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