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One of the reason for these sets is mathematics ℜ <> ℝ in a math text (and BTW the math symbols ℂℍℕℙℚℝ in the double strike set are "out of sequence" which can
by folbec 8y ago
One of the reason for these sets is mathematics ℜ <> ℝ in a math text (and BTW the math symbols ℂℍℕℙℚℝ in the double strike set are "out of sequence" which can be a nasty surprise if you do naive incrementation.
- duskwuff 8y agoAnd ℤ. The reason these double-struck symbols are in a weird place (U+2100-214f, separate from the rest in U+1d400-1d7ff) is because they all have commonly used special meanings in mathematics -- they're used to represent the sets of all numbers of various types. ℂ = complex numbers, ℍ = quaternions, ℕ = natural numbers, ℚ = rational numbers, ℝ = real numbers, ℤ = integers.