英文:
characters missing in the unicode standard
问题
Unicode标准中偶尔会缺少一些字符（也就是说，这些字符不仅在应用程序使用的字体中缺失）。例如，数学字母数字符号的Unicode块缺少MATHEMATICAL DOUBLE-STRUCK CAPITAL N、Q和R（在数学中常用于表示整数、有理数和实数）。请参考以下链接：https://www.fileformat.info/info/unicode/block/mathematical_alphanumeric_symbols/list.htm。
这是为什么？以及如何解决这个问题？看起来最常用的双划线大写字符缺失。（我注意到在与数学相关的其他Unicode块中也存在类似的问题。）
英文:
Occasionally I need characters that seem to be missing in the unicode standard (that is, these characters are not just missing in a font used by an application). For example the unicode block with mathematical alphanumeric symbols lacks the MATHEMATICAL DOUBLE-STRUCK CAPITAL N, Q and R (commonly used in math to denote integer, rational, and real numbers). See, for example, <https://www.fileformat.info/info/unicode/block/mathematical_alphanumeric_symbols/list.htm>.
What is the reason for this and how can one work around it? It seems to me that the most commonly used double-struck capital characters are missing. (I have noticed similar issues in other unicode blocks relevant for math.)
答案1
得分: 2
这些字母可以在类似字母符号范围中较早地找到：
- ℂ（U+2102）
- ℍ（U+210D）
- ℕ（U+2115）
- ℙ（U+2119）
- ℚ（U+211A）
- ℝ（U+211D）
- ℤ（U+2124）
英文:
Those letters are found earlier in the Letter-like symbols range:
- ℂ (U+2102)
- ℍ (U+210D)
- ℕ (U+2115)
- ℙ (U+2119)
- ℚ (U+211A)
- ℝ (U+211D)
- ℤ (U+2124)
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