On 10 Jun 2014, at 14:29, Philippe Verdy <verdy_p_at_wanadoo.fr> wrote:
> ℕ ⊃ℤ ⊃ℚ ⊃ℝ ⊃ℂ are without doubt more useful and more common in double-struck styles than in Fraktur styles.
Fraktur would normally be for Lie algebras. For sets, some other style or none. And logicians use their own notation.
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Received on Tue Jun 10 2014 - 07:58:23 CDT
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