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m Ordered the number types to be consistent with other wiki descriptions, e.g. the 2nd diagram on https://en.wikipedia.org/wiki/Natural_number |
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:{{math|'''∅'''}} – [[empty set]] (also <math>\emptyset</math> or <math>\varnothing</math> or {{math|{}}} are common)
:{{math|'''\mathbb{N}'''}} – [[natural number]]s
:{{math|'''\mathbb{Z}'''}} – [[integer]]s (from ''Zahl'', German for ''[[number]]'').
:{{math|'''\mathbb{Q}'''}} – [[rational number]]s (from ''[[quotient]]'')
:{{math|'''\mathbb{R}'''}} – [[real number]]s
:{{math|'''\mathbb{C}'''}} – [[complex number]]s
Some authors use the [[blackboard bold]] font for these particular sets (<math>\mathbb{C}</math>, <math>\mathbb{N}</math>, etc.). This usage is widely accepted in handwriting, but many mathematicians, and such experts on mathematical typography as [[Donald Knuth]], advise against its use in print.<ref>Krantz, S., ''Handbook of Typography for the Mathematical Sciences'', Chapman & Hall/CRC, Boca Raton, Florida, 2001, p. 35.</ref>
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